diff --git a/.gitignore b/.gitignore
index 7261c536..ed3052fd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -30,9 +30,6 @@ _ReSharper*/
 # sensitive files
 appsettings.Development.json
 
-# generated build files
-build/0Harmony.*
-
 # Azure generated files
 src/SMAPI.Web/Properties/PublishProfiles/*.pubxml
 
diff --git a/build/0Harmony.dll b/build/0Harmony.dll
new file mode 100644
index 00000000..2e893d0e
Binary files /dev/null and b/build/0Harmony.dll differ
diff --git a/build/common.targets b/build/common.targets
index 8ad5e88b..eebad019 100644
--- a/build/common.targets
+++ b/build/common.targets
@@ -4,7 +4,7 @@
 
   <!--set properties -->
   <PropertyGroup>
-    <Version>3.5.0</Version>
+    <Version>3.6.1</Version>
     <Product>SMAPI</Product>
 
     <LangVersion>latest</LangVersion>
diff --git a/docs/release-notes.md b/docs/release-notes.md
index c47ee835..1fa58807 100644
--- a/docs/release-notes.md
+++ b/docs/release-notes.md
@@ -1,45 +1,58 @@
 &larr; [README](README.md)
 
 # Release notes
-## Upcoming release + 1
+<!--
+## Future release
 * For modders:
   * Migrated to Harmony 2.0 (see [_migrate to Harmony 2.0_](https://stardewvalleywiki.com/Modding:Migrate_to_Harmony_2.0) for more info).
-  * Added `harmony_summary` console command which lists all current Harmony patches, optionally with a search filter.
+-->
+
+## 3.6.1
+Released 21 June 2020 for Stardew Valley 1.4.1 or later.
+
+* Fixed event priority sorting.
+
+## 3.6
+Released 20 June 2020 for Stardew Valley 1.4.1 or later.
 
-## Upcoming release
 * For players:
-  * Mod warnings are now listed alphabetically.
+  * Added crossplatform compatibility for mods which use the `[HarmonyPatch(type)]` attribute.
+  * Added experimental option to reduce startup time when loading mod DLLs (thanks to ZaneYork!). Enable `RewriteInParallel` in the `smapi-internal/config.json` to try it.
+  * Reduced processing time when a mod loads many unpacked images (thanks to Entoarox!).
+  * Mod load warnings are now listed alphabetically.
   * MacOS files starting with `._` are now ignored and can no longer cause skipped mods.
   * Simplified paranoid warning logs and reduced their log level.
-  * Reduced startup time when loading mod DLLs (thanks to ZaneYork!).
-  * Reduced processing time when a mod loads many unpacked images (thanks to Entoarox!).
-  * Fixed `BadImageFormatException` error detection.
   * Fixed black maps on Android for mods which use `.tmx` files.
+  * Fixed `BadImageFormatException` error detection.
+  * Fixed `reload_i18n` command not reloading content pack translations.
 
 * For the web UI:
   * Added GitHub licenses to mod compatibility list.
+  * Improved JSON validator:
+    * added SMAPI `i18n` schema;
+    * editing an uploaded file now remembers the selected schema;
+    * changed default schema to plain JSON.
   * Updated ModDrop URLs.
   * Internal changes to improve performance and reliability.
 
 * For modders:
   * Added [event priorities](https://stardewvalleywiki.com/Modding:Modder_Guide/APIs/Events#Custom_priority) (thanks to spacechase0!).
   * Added [update subkeys](https://stardewvalleywiki.com/Modding:Modder_Guide/APIs/Update_checks#Update_subkeys).
+  * Added [a custom build of Harmony](https://github.com/Pathoschild/Harmony#readme) to provide more useful stack traces in error logs.
+  * Added `harmony_summary` console command to list or search current Harmony patches.
   * Added `Multiplayer.PeerConnected` event.
-  * Added ability to override update keys from the compatibility list.
-  * Harmony mods which use the `[HarmonyPatch(type)]` attribute now work crossplatform. Previously SMAPI couldn't rewrite types in custom attributes for compatibility.
-  * Improved mod rewriting for compatibility:
-    * Fixed rewriting types in custom attributes.
-    * Fixed rewriting generic types to method references.
-  * Fixed `helper.Reflection` blocking access to game methods/properties that were extended by SMAPI.
+  * Added support for overriding update keys from the wiki compatibility list.
+  * Improved mod rewriting for compatibility to support more cases (e.g. custom attributes and generic types).
+  * Fixed `helper.Reflection` blocking access to game methods/properties intercepted by SMAPI.
   * Fixed asset propagation for Gil's portraits.
-  * Fixed `.pdb` files ignored for error stack traces for mods rewritten by SMAPI.
+  * Fixed `.pdb` files ignored for error stack traces when mods are rewritten by SMAPI.
   * Fixed `ModMessageReceived` event handlers not tracked for performance monitoring.
 
 * For SMAPI developers:
-  * Added support for bundling a custom Harmony build for upcoming use.
   * Eliminated MongoDB storage in the web services, which complicated the code unnecessarily. The app still uses an abstract interface for storage, so we can wrap a distributed cache in the future if needed.
-  * Overhauled update checks to simplify individual clients, centralize common logic, and enable upcoming features.
+  * Overhauled update checks to simplify mod site integrations, centralize common logic, and enable upcoming features.
   * Merged the separate legacy redirects app on AWS into the main app on Azure.
+  * Changed SMAPI's Harmony ID from `io.smapi` to `SMAPI` for readability in Harmony summaries.
 
 ## 3.5
 Released 27 April 2020 for Stardew Valley 1.4.1 or later.
diff --git a/docs/technical/smapi.md b/docs/technical/smapi.md
index 3b2d6e56..3cb450ae 100644
--- a/docs/technical/smapi.md
+++ b/docs/technical/smapi.md
@@ -58,7 +58,7 @@ SMAPI uses a small number of conditional compilation constants, which you can se
 flag | purpose
 ---- | -------
 `SMAPI_FOR_WINDOWS` | Whether SMAPI is being compiled on Windows for players on Windows. Set automatically in `crossplatform.targets`.
-`HARMONY_2` | Whether to enable experimental Harmony 2.0 support. Existing Harmony 1._x_ mods will be rewritten automatically for compatibility.
+`HARMONY_2` | Whether to enable experimental Harmony 2.0 support and rewrite existing Harmony 1._x_ mods for compatibility. Note that you need to replace `build/0Harmony.dll` with a Harmony 2.0 build (or switch to a package reference) to use this flag.
 
 ## For SMAPI developers
 ### Compiling from source
@@ -81,8 +81,8 @@ To prepare a crossplatform SMAPI release, you'll need to compile it on two platf
 [crossplatforming info](https://stardewvalleywiki.com/Modding:Modder_Guide/Test_and_Troubleshoot#Testing_on_all_platforms)
 on the wiki for the first-time setup.
 
-1. Update the version number in `.root/build/common.targets` and `Constants::Version`. Make sure
-  you use a [semantic version](https://semver.org). Recommended format:
+1. Update the version numbers in `build/common.targets`, `Constants`, and the `manifest.json` for
+   bundled mods. Make sure you use a [semantic version](https://semver.org). Recommended format:
 
    build type | format                   | example
    :--------- | :----------------------- | :------
@@ -102,14 +102,10 @@ on the wiki for the first-time setup.
    3. Rename the folders to `SMAPI <version> installer` and `SMAPI <version> installer for developers`.
    4. Zip the two folders.
 
-### Using a custom Harmony build
-The official SMAPI releases include [a custom build of Harmony](https://github.com/Pathoschild/Harmony),
-but compiling from source will use the official build. To use a custom build, put `0Harmony.dll` in
-the `build` folder and it'll be referenced automatically.
-
-Note that Harmony merges its dependencies into `0Harmony.dll` when compiled in release mode. To use
-a debug build of Harmony, you'll need to manually copy those dependencies into your game's
-`smapi-internal` folder.
+### Custom Harmony build
+SMAPI uses [a custom build of Harmony](https://github.com/Pathoschild/Harmony#readme), which is
+included in the `build` folder. To use a different build, just replace `0Harmony.dll` in that
+folder.
 
 ## Release notes
 See [release notes](../release-notes.md).
diff --git a/docs/technical/web.md b/docs/technical/web.md
index d21b87ac..50237bfe 100644
--- a/docs/technical/web.md
+++ b/docs/technical/web.md
@@ -110,8 +110,9 @@ Available schemas:
 
 format | schema URL
 ------ | ----------
-[SMAPI `manifest.json`](https://stardewvalleywiki.com/Modding:Modder_Guide/APIs/Manifest) | https://smapi.io/schemas/manifest.json
-[Content Patcher `content.json`](https://github.com/Pathoschild/StardewMods/tree/develop/ContentPatcher#readme) | https://smapi.io/schemas/content-patcher.json
+[SMAPI: `manifest.json`](https://stardewvalleywiki.com/Modding:Modder_Guide/APIs/Manifest) | https://smapi.io/schemas/manifest.json
+[SMAPI: translations (`i18n` folder)](https://stardewvalleywiki.com/Modding:Modder_Guide/APIs/Translation) | https://smapi.io/schemas/i18n.json
+[Content Patcher: `content.json`](https://github.com/Pathoschild/StardewMods/tree/develop/ContentPatcher#readme) | https://smapi.io/schemas/content-patcher.json
 
 ## Web API
 ### Overview
diff --git a/src/SMAPI.Mods.ConsoleCommands/manifest.json b/src/SMAPI.Mods.ConsoleCommands/manifest.json
index 908d4f65..7300cdf8 100644
--- a/src/SMAPI.Mods.ConsoleCommands/manifest.json
+++ b/src/SMAPI.Mods.ConsoleCommands/manifest.json
@@ -1,9 +1,9 @@
 {
     "Name": "Console Commands",
     "Author": "SMAPI",
-    "Version": "3.5.0",
+    "Version": "3.6.1",
     "Description": "Adds SMAPI console commands that let you manipulate the game.",
     "UniqueID": "SMAPI.ConsoleCommands",
     "EntryDll": "ConsoleCommands.dll",
-    "MinimumApiVersion": "3.5.0"
+    "MinimumApiVersion": "3.6.1"
 }
diff --git a/src/SMAPI.Mods.SaveBackup/manifest.json b/src/SMAPI.Mods.SaveBackup/manifest.json
index cd42459e..cffd780d 100644
--- a/src/SMAPI.Mods.SaveBackup/manifest.json
+++ b/src/SMAPI.Mods.SaveBackup/manifest.json
@@ -1,9 +1,9 @@
 {
     "Name": "Save Backup",
     "Author": "SMAPI",
-    "Version": "3.5.0",
+    "Version": "3.6.1",
     "Description": "Automatically backs up all your saves once per day into its folder.",
     "UniqueID": "SMAPI.SaveBackup",
     "EntryDll": "SaveBackup.dll",
-    "MinimumApiVersion": "3.5.0"
+    "MinimumApiVersion": "3.6.1"
 }
diff --git a/src/SMAPI.Web/Controllers/JsonValidatorController.cs b/src/SMAPI.Web/Controllers/JsonValidatorController.cs
index c43fb929..5f83eafd 100644
--- a/src/SMAPI.Web/Controllers/JsonValidatorController.cs
+++ b/src/SMAPI.Web/Controllers/JsonValidatorController.cs
@@ -27,12 +27,13 @@ namespace StardewModdingAPI.Web.Controllers
         private readonly IDictionary<string, string> SchemaFormats = new Dictionary<string, string>
         {
             ["none"] = "None",
-            ["manifest"] = "Manifest",
+            ["manifest"] = "SMAPI: manifest",
+            ["i18n"] = "SMAPI: translations (i18n)",
             ["content-patcher"] = "Content Patcher"
         };
 
         /// <summary>The schema ID to use if none was specified.</summary>
-        private string DefaultSchemaID = "manifest";
+        private string DefaultSchemaID = "none";
 
         /// <summary>A token in an error message which indicates that the child errors should be displayed instead.</summary>
         private readonly string TransparentToken = "$transparent";
@@ -57,16 +58,22 @@ namespace StardewModdingAPI.Web.Controllers
         /// <summary>Render the schema validator UI.</summary>
         /// <param name="schemaName">The schema name with which to validate the JSON, or 'edit' to return to the edit screen.</param>
         /// <param name="id">The stored file ID.</param>
+        /// <param name="operation">The operation to perform for the selected log ID. This can be 'edit', or any other value to view.</param>
         [HttpGet]
         [Route("json")]
         [Route("json/{schemaName}")]
         [Route("json/{schemaName}/{id}")]
-        public async Task<ViewResult> Index(string schemaName = null, string id = null)
+        [Route("json/{schemaName}/{id}/{operation}")]
+        public async Task<ViewResult> Index(string schemaName = null, string id = null, string operation = null)
         {
+            // parse arguments
             schemaName = this.NormalizeSchemaName(schemaName);
+            bool hasId = !string.IsNullOrWhiteSpace(id);
+            bool isEditView = !hasId || operation?.Trim().ToLower() == "edit";
 
-            var result = new JsonValidatorModel(id, schemaName, this.SchemaFormats);
-            if (string.IsNullOrWhiteSpace(id))
+            // build result model
+            var result = this.GetModel(id, schemaName, isEditView);
+            if (!hasId)
                 return this.View("Index", result);
 
             // fetch raw JSON
@@ -76,7 +83,7 @@ namespace StardewModdingAPI.Web.Controllers
             result.SetContent(file.Content, expiry: file.Expiry, uploadWarning: file.Warning);
 
             // skip parsing if we're going to the edit screen
-            if (schemaName?.ToLower() == "edit")
+            if (isEditView)
                 return this.View("Index", result);
 
             // parse JSON
@@ -130,7 +137,7 @@ namespace StardewModdingAPI.Web.Controllers
         public async Task<ActionResult> PostAsync(JsonValidatorRequestModel request)
         {
             if (request == null)
-                return this.View("Index", this.GetModel(null, null).SetUploadError("The request seems to be invalid."));
+                return this.View("Index", this.GetModel(null, null, isEditView: true).SetUploadError("The request seems to be invalid."));
 
             // normalize schema name
             string schemaName = this.NormalizeSchemaName(request.SchemaName);
@@ -138,12 +145,12 @@ namespace StardewModdingAPI.Web.Controllers
             // get raw text
             string input = request.Content;
             if (string.IsNullOrWhiteSpace(input))
-                return this.View("Index", this.GetModel(null, schemaName).SetUploadError("The JSON file seems to be empty."));
+                return this.View("Index", this.GetModel(null, schemaName, isEditView: true).SetUploadError("The JSON file seems to be empty."));
 
             // upload file
             UploadResult result = await this.Storage.SaveAsync(input);
             if (!result.Succeeded)
-                return this.View("Index", this.GetModel(result.ID, schemaName).SetUploadError(result.UploadError));
+                return this.View("Index", this.GetModel(result.ID, schemaName, isEditView: true).SetContent(input, null).SetUploadError(result.UploadError));
 
             // redirect to view
             return this.Redirect(this.Url.PlainAction("Index", "JsonValidator", new { schemaName = schemaName, id = result.ID }));
@@ -156,9 +163,10 @@ namespace StardewModdingAPI.Web.Controllers
         /// <summary>Build a JSON validator model.</summary>
         /// <param name="pasteID">The stored file ID.</param>
         /// <param name="schemaName">The schema name with which the JSON was validated.</param>
-        private JsonValidatorModel GetModel(string pasteID, string schemaName)
+        /// <param name="isEditView">Whether to show the edit view.</param>
+        private JsonValidatorModel GetModel(string pasteID, string schemaName, bool isEditView)
         {
-            return new JsonValidatorModel(pasteID, schemaName, this.SchemaFormats);
+            return new JsonValidatorModel(pasteID, schemaName, this.SchemaFormats, isEditView);
         }
 
         /// <summary>Get a normalized schema name, or the <see cref="DefaultSchemaID"/> if blank.</summary>
diff --git a/src/SMAPI.Web/ViewModels/JsonValidator/JsonValidatorModel.cs b/src/SMAPI.Web/ViewModels/JsonValidator/JsonValidatorModel.cs
index c0dd7184..0ea69911 100644
--- a/src/SMAPI.Web/ViewModels/JsonValidator/JsonValidatorModel.cs
+++ b/src/SMAPI.Web/ViewModels/JsonValidator/JsonValidatorModel.cs
@@ -10,6 +10,9 @@ namespace StardewModdingAPI.Web.ViewModels.JsonValidator
         /*********
         ** Accessors
         *********/
+        /// <summary>Whether to show the edit view.</summary>
+        public bool IsEditView { get; set; }
+
         /// <summary>The paste ID.</summary>
         public string PasteID { get; set; }
 
@@ -51,11 +54,13 @@ namespace StardewModdingAPI.Web.ViewModels.JsonValidator
         /// <param name="pasteID">The stored file ID.</param>
         /// <param name="schemaName">The schema name with which the JSON was validated.</param>
         /// <param name="schemaFormats">The supported JSON schemas (names indexed by ID).</param>
-        public JsonValidatorModel(string pasteID, string schemaName, IDictionary<string, string> schemaFormats)
+        /// <param name="isEditView">Whether to show the edit view.</param>
+        public JsonValidatorModel(string pasteID, string schemaName, IDictionary<string, string> schemaFormats, bool isEditView)
         {
             this.PasteID = pasteID;
             this.SchemaName = schemaName;
             this.SchemaFormats = schemaFormats;
+            this.IsEditView = isEditView;
         }
 
         /// <summary>Set the validated content.</summary>
diff --git a/src/SMAPI.Web/Views/JsonValidator/Index.cshtml b/src/SMAPI.Web/Views/JsonValidator/Index.cshtml
index f23bd150..7b89a23d 100644
--- a/src/SMAPI.Web/Views/JsonValidator/Index.cshtml
+++ b/src/SMAPI.Web/Views/JsonValidator/Index.cshtml
@@ -9,7 +9,6 @@
     string newUploadUrl = this.Url.PlainAction("Index", "JsonValidator", new { schemaName = Model.SchemaName });
     string schemaDisplayName = null;
     bool isValidSchema = Model.SchemaName != null && Model.SchemaFormats.TryGetValue(Model.SchemaName, out schemaDisplayName) && schemaDisplayName?.ToLower() != "none";
-    bool isEditView = Model.Content == null || Model.SchemaName?.ToLower() == "edit";
 
     // build title
     ViewData["Title"] = "JSON validator";
@@ -63,7 +62,7 @@ else if (Model.ParseError != null)
         <small v-pre>Error details: @Model.ParseError</small>
     </div>
 }
-else if (!isEditView && Model.PasteID != null)
+else if (!Model.IsEditView && Model.PasteID != null)
 {
     <div class="banner success">
         <strong>Share this link to let someone else see this page:</strong> <code>@curPageUrl</code><br />
@@ -84,7 +83,7 @@ else if (!isEditView && Model.PasteID != null)
 }
 
 @* upload new file *@
-@if (isEditView)
+@if (Model.IsEditView)
 {
     <h2>Upload a JSON file</h2>
     <form action="@this.Url.PlainAction("PostAsync", "JsonValidator")" method="post">
@@ -112,7 +111,7 @@ else if (!isEditView && Model.PasteID != null)
 }
 
 @* validation results *@
-@if (!isEditView)
+@if (!Model.IsEditView)
 {
     <div id="output">
         @if (Model.UploadError == null)
@@ -158,7 +157,7 @@ else if (!isEditView && Model.PasteID != null)
                 {
                     <option value="@pair.Key" selected="@(Model.SchemaName == pair.Key)">@pair.Value</option>
                 }
-            </select>) or <a href="@(this.Url.PlainAction("Index", "JsonValidator", new { id = this.Model.PasteID, schemaName = "edit" }))">edit this file</a>.
+            </select>) or <a href="@(this.Url.PlainAction("Index", "JsonValidator", new { id = this.Model.PasteID, schemaName = this.Model.SchemaName, operation = "edit" }))">edit this file</a>.
         </div>
         <pre id="raw-content" class="sunlight-highlight-javascript">@Model.Content</pre>
 
diff --git a/src/SMAPI.Web/Views/Mods/Index.cshtml b/src/SMAPI.Web/Views/Mods/Index.cshtml
index cda2923d..fa77c220 100644
--- a/src/SMAPI.Web/Views/Mods/Index.cshtml
+++ b/src/SMAPI.Web/Views/Mods/Index.cshtml
@@ -8,8 +8,8 @@
 
     TimeSpan staleAge = DateTimeOffset.UtcNow - Model.LastUpdated;
 
-    bool hasBeta = true; // Model.BetaVersion != null;
-    string betaLabel = "SMAPI 3.6 only"; //"SDV @Model.BetaVersion only";
+    bool hasBeta = Model.BetaVersion != null;
+    string betaLabel = "SDV @Model.BetaVersion only";
 }
 @section Head {
     <link rel="stylesheet" href="~/Content/css/mods.css?r=20200218" />
diff --git a/src/SMAPI.Web/wwwroot/schemas/i18n.json b/src/SMAPI.Web/wwwroot/schemas/i18n.json
new file mode 100644
index 00000000..493ad213
--- /dev/null
+++ b/src/SMAPI.Web/wwwroot/schemas/i18n.json
@@ -0,0 +1,24 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "$id": "https://smapi.io/schemas/i18n.json",
+    "title": "SMAPI i18n file",
+    "description": "A translation file for a SMAPI mod or content pack.",
+    "@documentationUrl": "https://stardewvalleywiki.com/Modding:Modder_Guide/APIs/Translation",
+    "type": "object",
+
+    "properties": {
+        "$schema": {
+            "title": "Schema",
+            "description": "A reference to this JSON schema. Not part of the actual format, but useful for validation tools.",
+            "type": "string",
+            "const": "https://smapi.io/schemas/manifest.json"
+        }
+    },
+
+    "additionalProperties": {
+        "type": "string",
+        "@errorMessages": {
+            "type": "Invalid property. Translation files can only contain text property values."
+        }
+    }
+}
diff --git a/src/SMAPI/Constants.cs b/src/SMAPI/Constants.cs
index 4d93d74c..34d8e082 100644
--- a/src/SMAPI/Constants.cs
+++ b/src/SMAPI/Constants.cs
@@ -24,7 +24,7 @@ namespace StardewModdingAPI
         ** Public
         ****/
         /// <summary>SMAPI's current semantic version.</summary>
-        public static ISemanticVersion ApiVersion { get; } = new Toolkit.SemanticVersion("3.6.0");
+        public static ISemanticVersion ApiVersion { get; } = new Toolkit.SemanticVersion("3.6.1");
 
         /// <summary>The minimum supported version of Stardew Valley.</summary>
         public static ISemanticVersion MinimumGameVersion { get; } = new GameVersion("1.4.5");
@@ -56,6 +56,14 @@ namespace StardewModdingAPI
         /****
         ** Internal
         ****/
+        /// <summary>Whether SMAPI was compiled in debug mode.</summary>
+        internal const bool IsDebugBuild =
+#if DEBUG
+            true;
+#else
+            false;
+#endif
+
         /// <summary>The URL of the SMAPI home page.</summary>
         internal const string HomePageUrl = "https://smapi.io";
 
diff --git a/src/SMAPI/Framework/Commands/HarmonySummaryCommand.cs b/src/SMAPI/Framework/Commands/HarmonySummaryCommand.cs
index 8c20fbdd..8fdd4282 100644
--- a/src/SMAPI/Framework/Commands/HarmonySummaryCommand.cs
+++ b/src/SMAPI/Framework/Commands/HarmonySummaryCommand.cs
@@ -1,16 +1,27 @@
-#if HARMONY_2
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
 using System.Text;
+#if HARMONY_2
 using HarmonyLib;
+#else
+using Harmony;
+#endif
 
 namespace StardewModdingAPI.Framework.Commands
 {
     /// <summary>The 'harmony_summary' SMAPI console command.</summary>
     internal class HarmonySummaryCommand : IInternalCommand
     {
+#if !HARMONY_2
+        /*********
+        ** Fields
+        *********/
+        /// <summary>The Harmony instance through which to fetch patch info.</summary>
+        private readonly HarmonyInstance HarmonyInstance = HarmonyInstance.Create($"SMAPI.{nameof(HarmonySummaryCommand)}");
+#endif
+
         /*********
         ** Accessors
         *********/
@@ -45,7 +56,16 @@ namespace StardewModdingAPI.Framework.Commands
                     foreach (var ownerGroup in match.PatchTypesByOwner.OrderBy(p => p.Key))
                     {
                         var sortedTypes = ownerGroup.Value
-                            .OrderBy(p => p switch { PatchType.Prefix => 0, PatchType.Postfix => 1, PatchType.Finalizer => 2, PatchType.Transpiler => 3, _ => 4 });
+                            .OrderBy(p => p switch
+                            {
+                                PatchType.Prefix => 0,
+                                PatchType.Postfix => 1,
+#if HARMONY_2
+                                PatchType.Finalizer => 2,
+#endif
+                                PatchType.Transpiler => 3,
+                                _ => 4
+                            });
 
                         result.AppendLine($"      - {ownerGroup.Key} ({string.Join(", ", sortedTypes).ToLower()})");
                     }
@@ -91,15 +111,26 @@ namespace StardewModdingAPI.Framework.Commands
         /// <summary>Get all current Harmony patches.</summary>
         private IEnumerable<SearchResult> GetAllPatches()
         {
+#if HARMONY_2
             foreach (MethodBase method in Harmony.GetAllPatchedMethods())
+#else
+            foreach (MethodBase method in this.HarmonyInstance.GetPatchedMethods())
+#endif
             {
                 // get metadata for method
+#if HARMONY_2
                 HarmonyLib.Patches patchInfo = Harmony.GetPatchInfo(method);
+#else
+                Harmony.Patches patchInfo = this.HarmonyInstance.GetPatchInfo(method);
+#endif
+
                 IDictionary<PatchType, IReadOnlyCollection<Patch>> patchGroups = new Dictionary<PatchType, IReadOnlyCollection<Patch>>
                 {
                     [PatchType.Prefix] = patchInfo.Prefixes,
                     [PatchType.Postfix] = patchInfo.Postfixes,
+#if HARMONY_2
                     [PatchType.Finalizer] = patchInfo.Finalizers,
+#endif
                     [PatchType.Transpiler] = patchInfo.Transpilers
                 };
 
@@ -129,8 +160,10 @@ namespace StardewModdingAPI.Framework.Commands
             /// <summary>A postfix patch.</summary>
             Postfix,
 
+#if HARMONY_2
             /// <summary>A finalizer patch.</summary>
             Finalizer,
+#endif
 
             /// <summary>A transpiler patch.</summary>
             Transpiler
@@ -167,4 +200,3 @@ namespace StardewModdingAPI.Framework.Commands
         }
     }
 }
-#endif
diff --git a/src/SMAPI/Framework/Events/ManagedEventHandler.cs b/src/SMAPI/Framework/Events/ManagedEventHandler.cs
index cf470c1e..b32a2a22 100644
--- a/src/SMAPI/Framework/Events/ManagedEventHandler.cs
+++ b/src/SMAPI/Framework/Events/ManagedEventHandler.cs
@@ -47,7 +47,7 @@ namespace StardewModdingAPI.Framework.Events
             if (!(obj is ManagedEventHandler<TEventArgs> other))
                 throw new ArgumentException("Can't compare to an unrelated object type.");
 
-            int priorityCompare = this.Priority.CompareTo(other.Priority);
+            int priorityCompare = -this.Priority.CompareTo(other.Priority); // higher value = sort first
             return priorityCompare != 0
                 ? priorityCompare
                 : this.RegistrationOrder.CompareTo(other.RegistrationOrder);
diff --git a/src/SMAPI/Framework/ModLoading/AssemblyLoader.cs b/src/SMAPI/Framework/ModLoading/AssemblyLoader.cs
index a7454082..cab05114 100644
--- a/src/SMAPI/Framework/ModLoading/AssemblyLoader.cs
+++ b/src/SMAPI/Framework/ModLoading/AssemblyLoader.cs
@@ -76,9 +76,10 @@ namespace StardewModdingAPI.Framework.ModLoading
         /// <param name="mod">The mod for which the assembly is being loaded.</param>
         /// <param name="assemblyPath">The assembly file path.</param>
         /// <param name="assumeCompatible">Assume the mod is compatible, even if incompatible code is detected.</param>
+        /// <param name="rewriteInParallel">Whether to enable experimental parallel rewriting.</param>
         /// <returns>Returns the rewrite metadata for the preprocessed assembly.</returns>
         /// <exception cref="IncompatibleInstructionException">An incompatible CIL instruction was found while rewriting the assembly.</exception>
-        public Assembly Load(IModMetadata mod, string assemblyPath, bool assumeCompatible)
+        public Assembly Load(IModMetadata mod, string assemblyPath, bool assumeCompatible, bool rewriteInParallel)
         {
             // get referenced local assemblies
             AssemblyParseResult[] assemblies;
@@ -108,7 +109,7 @@ namespace StardewModdingAPI.Framework.ModLoading
                     continue;
 
                 // rewrite assembly
-                bool changed = this.RewriteAssembly(mod, assembly.Definition, loggedMessages, logPrefix: "      ");
+                bool changed = this.RewriteAssembly(mod, assembly.Definition, loggedMessages, logPrefix: "      ", rewriteInParallel);
 
                 // detect broken assembly reference
                 foreach (AssemblyNameReference reference in assembly.Definition.MainModule.AssemblyReferences)
@@ -279,9 +280,10 @@ namespace StardewModdingAPI.Framework.ModLoading
         /// <param name="assembly">The assembly to rewrite.</param>
         /// <param name="loggedMessages">The messages that have already been logged for this mod.</param>
         /// <param name="logPrefix">A string to prefix to log messages.</param>
+        /// <param name="rewriteInParallel">Whether to enable experimental parallel rewriting.</param>
         /// <returns>Returns whether the assembly was modified.</returns>
         /// <exception cref="IncompatibleInstructionException">An incompatible CIL instruction was found while rewriting the assembly.</exception>
-        private bool RewriteAssembly(IModMetadata mod, AssemblyDefinition assembly, HashSet<string> loggedMessages, string logPrefix)
+        private bool RewriteAssembly(IModMetadata mod, AssemblyDefinition assembly, HashSet<string> loggedMessages, string logPrefix, bool rewriteInParallel)
         {
             ModuleDefinition module = assembly.MainModule;
             string filename = $"{assembly.Name.Name}.dll";
@@ -330,7 +332,7 @@ namespace StardewModdingAPI.Framework.ModLoading
                     return rewritten;
                 }
             );
-            bool anyRewritten = rewriter.RewriteModule();
+            bool anyRewritten = rewriter.RewriteModule(rewriteInParallel);
 
             // handle rewrite flags
             foreach (IInstructionHandler handler in handlers)
diff --git a/src/SMAPI/Framework/ModLoading/Framework/RecursiveRewriter.cs b/src/SMAPI/Framework/ModLoading/Framework/RecursiveRewriter.cs
index 9dc3680f..34c78c7d 100644
--- a/src/SMAPI/Framework/ModLoading/Framework/RecursiveRewriter.cs
+++ b/src/SMAPI/Framework/ModLoading/Framework/RecursiveRewriter.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
@@ -56,15 +57,20 @@ namespace StardewModdingAPI.Framework.ModLoading.Framework
         }
 
         /// <summary>Rewrite the loaded module code.</summary>
+        /// <param name="rewriteInParallel">Whether to enable experimental parallel rewriting.</param>
         /// <returns>Returns whether the module was modified.</returns>
-        public bool RewriteModule()
+        public bool RewriteModule(bool rewriteInParallel)
         {
-            int typesChanged = 0;
-            Exception exception = null;
+            IEnumerable<TypeDefinition> types = this.Module.GetTypes().Where(type => type.BaseType != null); // skip special types like <Module>
 
-            Parallel.ForEach(
-                source: this.Module.GetTypes().Where(type => type.BaseType != null), // skip special types like <Module>
-                body: type =>
+            // experimental parallel rewriting
+            // This may cause intermittent startup errors and is disabled by default: https://github.com/Pathoschild/SMAPI/issues/721
+            if (rewriteInParallel)
+            {
+                int typesChanged = 0;
+                Exception exception = null;
+
+                Parallel.ForEach(types, type =>
                 {
                     if (exception != null)
                         return;
@@ -72,50 +78,7 @@ namespace StardewModdingAPI.Framework.ModLoading.Framework
                     bool changed = false;
                     try
                     {
-                        changed |= this.RewriteCustomAttributes(type.CustomAttributes);
-                        changed |= this.RewriteGenericParameters(type.GenericParameters);
-
-                        foreach (InterfaceImplementation @interface in type.Interfaces)
-                            changed |= this.RewriteTypeReference(@interface.InterfaceType, newType => @interface.InterfaceType = newType);
-
-                        if (type.BaseType.FullName != "System.Object")
-                            changed |= this.RewriteTypeReference(type.BaseType, newType => type.BaseType = newType);
-
-                        foreach (MethodDefinition method in type.Methods)
-                        {
-                            changed |= this.RewriteTypeReference(method.ReturnType, newType => method.ReturnType = newType);
-                            changed |= this.RewriteGenericParameters(method.GenericParameters);
-                            changed |= this.RewriteCustomAttributes(method.CustomAttributes);
-
-                            foreach (ParameterDefinition parameter in method.Parameters)
-                                changed |= this.RewriteTypeReference(parameter.ParameterType, newType => parameter.ParameterType = newType);
-
-                            foreach (var methodOverride in method.Overrides)
-                                changed |= this.RewriteMethodReference(methodOverride);
-
-                            if (method.HasBody)
-                            {
-                                foreach (VariableDefinition variable in method.Body.Variables)
-                                    changed |= this.RewriteTypeReference(variable.VariableType, newType => variable.VariableType = newType);
-
-                                // check CIL instructions
-                                ILProcessor cil = method.Body.GetILProcessor();
-                                Collection<Instruction> instructions = cil.Body.Instructions;
-                                for (int i = 0; i < instructions.Count; i++)
-                                {
-                                    var instruction = instructions[i];
-                                    if (instruction.OpCode.Code == Code.Nop)
-                                        continue;
-
-                                    changed |= this.RewriteInstruction(instruction, cil, newInstruction =>
-                                    {
-                                        changed = true;
-                                        cil.Replace(instruction, newInstruction);
-                                        instruction = newInstruction;
-                                    });
-                                }
-                            }
-                        }
+                        changed = this.RewriteTypeDefinition(type);
                     }
                     catch (Exception ex)
                     {
@@ -124,18 +87,90 @@ namespace StardewModdingAPI.Framework.ModLoading.Framework
 
                     if (changed)
                         Interlocked.Increment(ref typesChanged);
-                }
-            );
+                });
 
-            return exception == null
-                 ? typesChanged > 0
-                 : throw new Exception($"Rewriting {this.Module.Name} failed.", exception);
+                return exception == null
+                    ? typesChanged > 0
+                    : throw new Exception($"Rewriting {this.Module.Name} failed.", exception);
+            }
+
+            // non-parallel rewriting
+            {
+                bool changed = false;
+
+                try
+                {
+                    foreach (var type in types)
+                        changed |= this.RewriteTypeDefinition(type);
+                }
+                catch (Exception ex)
+                {
+                    throw new Exception($"Rewriting {this.Module.Name} failed.", ex);
+                }
+
+                return changed;
+            }
         }
 
 
         /*********
         ** Private methods
         *********/
+        /// <summary>Rewrite a loaded type definition.</summary>
+        /// <param name="type">The type definition to rewrite.</param>
+        /// <returns>Returns whether the type was modified.</returns>
+        private bool RewriteTypeDefinition(TypeDefinition type)
+        {
+            bool changed = false;
+
+            changed |= this.RewriteCustomAttributes(type.CustomAttributes);
+            changed |= this.RewriteGenericParameters(type.GenericParameters);
+
+            foreach (InterfaceImplementation @interface in type.Interfaces)
+                changed |= this.RewriteTypeReference(@interface.InterfaceType, newType => @interface.InterfaceType = newType);
+
+            if (type.BaseType.FullName != "System.Object")
+                changed |= this.RewriteTypeReference(type.BaseType, newType => type.BaseType = newType);
+
+            foreach (MethodDefinition method in type.Methods)
+            {
+                changed |= this.RewriteTypeReference(method.ReturnType, newType => method.ReturnType = newType);
+                changed |= this.RewriteGenericParameters(method.GenericParameters);
+                changed |= this.RewriteCustomAttributes(method.CustomAttributes);
+
+                foreach (ParameterDefinition parameter in method.Parameters)
+                    changed |= this.RewriteTypeReference(parameter.ParameterType, newType => parameter.ParameterType = newType);
+
+                foreach (var methodOverride in method.Overrides)
+                    changed |= this.RewriteMethodReference(methodOverride);
+
+                if (method.HasBody)
+                {
+                    foreach (VariableDefinition variable in method.Body.Variables)
+                        changed |= this.RewriteTypeReference(variable.VariableType, newType => variable.VariableType = newType);
+
+                    // check CIL instructions
+                    ILProcessor cil = method.Body.GetILProcessor();
+                    Collection<Instruction> instructions = cil.Body.Instructions;
+                    for (int i = 0; i < instructions.Count; i++)
+                    {
+                        var instruction = instructions[i];
+                        if (instruction.OpCode.Code == Code.Nop)
+                            continue;
+
+                        changed |= this.RewriteInstruction(instruction, cil, newInstruction =>
+                        {
+                            changed = true;
+                            cil.Replace(instruction, newInstruction);
+                            instruction = newInstruction;
+                        });
+                    }
+                }
+            }
+
+            return changed;
+        }
+
         /// <summary>Rewrite a CIL instruction if needed.</summary>
         /// <param name="instruction">The current CIL instruction.</param>
         /// <param name="cil">The CIL instruction processor.</param>
diff --git a/src/SMAPI/Framework/Models/SConfig.cs b/src/SMAPI/Framework/Models/SConfig.cs
index de99a464..8be7998a 100644
--- a/src/SMAPI/Framework/Models/SConfig.cs
+++ b/src/SMAPI/Framework/Models/SConfig.cs
@@ -15,12 +15,8 @@ namespace StardewModdingAPI.Framework.Models
         private static readonly IDictionary<string, object> DefaultValues = new Dictionary<string, object>
         {
             [nameof(CheckForUpdates)] = true,
-            [nameof(ParanoidWarnings)] =
-#if DEBUG
-                true,
-#else
-                false,
-#endif
+            [nameof(ParanoidWarnings)] = Constants.IsDebugBuild,
+            [nameof(RewriteInParallel)] = Constants.IsDebugBuild,
             [nameof(UseBetaChannel)] = Constants.ApiVersion.IsPrerelease(),
             [nameof(GitHubProjectName)] = "MartyrPher/SMAPI-Android-Installer",
             [nameof(WebApiBaseUrl)] = "https://smapi.io/api/",
@@ -48,6 +44,9 @@ namespace StardewModdingAPI.Framework.Models
         /// <summary>Whether to check for newer versions of SMAPI and mods on startup.</summary>
         public bool CheckForUpdates { get; set; }
 
+        /// <summary>Whether to enable experimental parallel rewriting.</summary>
+        public bool RewriteInParallel { get; set; } = (bool)SConfig.DefaultValues[nameof(SConfig.RewriteInParallel)];
+
         /// <summary>Whether to add a section to the 'mod issues' list for mods which which directly use potentially sensitive .NET APIs like file or shell access.</summary>
         public bool ParanoidWarnings { get; set; } = (bool)SConfig.DefaultValues[nameof(SConfig.ParanoidWarnings)];
 
diff --git a/src/SMAPI/Framework/Patching/GamePatcher.cs b/src/SMAPI/Framework/Patching/GamePatcher.cs
index 7c31616f..9716e350 100644
--- a/src/SMAPI/Framework/Patching/GamePatcher.cs
+++ b/src/SMAPI/Framework/Patching/GamePatcher.cs
@@ -2,6 +2,7 @@ using System;
 #if HARMONY_2
 using HarmonyLib;
 #else
+using MonoMod.RuntimeDetour;
 using Harmony;
 #endif
 
@@ -34,6 +35,13 @@ namespace StardewModdingAPI.Framework.Patching
 #if HARMONY_2
             Harmony harmony = new Harmony("SMAPI");
 #else
+            if (!HarmonyDetourBridge.Initialized && Constants.HarmonyEnabled)
+            {
+                try {
+                    HarmonyDetourBridge.Init();
+                }
+                catch { Constants.HarmonyEnabled = false; }
+            }
             HarmonyInstance harmony = HarmonyInstance.Create("SMAPI");
 #endif
             foreach (IHarmonyPatch patch in patches)
diff --git a/src/SMAPI/Framework/SCore.cs b/src/SMAPI/Framework/SCore.cs
index baf410aa..5649a3e6 100644
--- a/src/SMAPI/Framework/SCore.cs
+++ b/src/SMAPI/Framework/SCore.cs
@@ -347,6 +347,8 @@ namespace StardewModdingAPI.Framework
             // add headers
             if (this.Settings.DeveloperMode)
                 this.Monitor.Log($"You have SMAPI for developers, so the console will be much more verbose. You can disable developer mode by installing the non-developer version of SMAPI, or by editing {Constants.ApiConfigPath}.", LogLevel.Info);
+            if (this.Settings.RewriteInParallel)
+                this.Monitor.Log($"You enabled experimental parallel rewriting. This may result in faster startup times, but intermittent startup errors. You can disable it by reinstalling SMAPI or editing {Constants.ApiConfigPath}.", LogLevel.Info);
             if (!this.Settings.CheckForUpdates)
                 this.Monitor.Log($"You configured SMAPI to not check for updates. Running an old version of SMAPI is not recommended. You can enable update checks by reinstalling SMAPI or editing {Constants.ApiConfigPath}.", LogLevel.Warn);
             //if (!this.Monitor.WriteToConsole)
@@ -489,9 +491,7 @@ namespace StardewModdingAPI.Framework
                 this.Monitor.Log("Type 'help' for help, or 'help <cmd>' for a command's usage", LogLevel.Info);
                 this.GameInstance.CommandManager
                     .Add(new HelpCommand(this.GameInstance.CommandManager), this.Monitor)
-#if HARMONY_2
                     .Add(new HarmonySummaryCommand(), this.Monitor)
-#endif
                     .Add(new ReloadI18nCommand(this.ReloadTranslations), this.Monitor);
 
                 // update window titles
@@ -540,9 +540,7 @@ namespace StardewModdingAPI.Framework
             this.Monitor.Log("Type 'help' for help, or 'help <cmd>' for a command's usage", LogLevel.Info);
             this.GameInstance.CommandManager
                 .Add(new HelpCommand(this.GameInstance.CommandManager), this.Monitor)
-#if HARMONY_2
                 .Add(new HarmonySummaryCommand(), this.Monitor)
-#endif
                 .Add(new ReloadI18nCommand(this.ReloadTranslations), this.Monitor);
 
             // start handling command line input
@@ -1013,7 +1011,7 @@ namespace StardewModdingAPI.Framework
                 Assembly modAssembly;
                 try
                 {
-                    modAssembly = assemblyLoader.Load(mod, assemblyPath, assumeCompatible: true);//mod.DataRecord?.Status == ModStatus.AssumeCompatible);
+                    modAssembly = assemblyLoader.Load(mod, assemblyPath, assumeCompatible: true/*mod.DataRecord?.Status == ModStatus.AssumeCompatible*/, rewriteInParallel: this.Settings.RewriteInParallel);
                     this.ModRegistry.TrackAssemblies(mod, modAssembly);
                 }
                 catch (IncompatibleInstructionException) // details already in trace logs
@@ -1310,7 +1308,7 @@ namespace StardewModdingAPI.Framework
         /// <summary>Reload translations for all mods.</summary>
         private void ReloadTranslations()
         {
-            this.ReloadTranslations(this.ModRegistry.GetAll(contentPacks: false));
+            this.ReloadTranslations(this.ModRegistry.GetAll());
         }
 
         /// <summary>Reload translations for the given mods.</summary>
diff --git a/src/SMAPI/SMAPI.config.json b/src/SMAPI/SMAPI.config.json
index aa650085..25e16bb1 100644
--- a/src/SMAPI/SMAPI.config.json
+++ b/src/SMAPI/SMAPI.config.json
@@ -33,18 +33,30 @@ copy all the settings, or you may cause bugs due to overridden changes in future
      */
     "DeveloperMode": true,
 
+    /**
+     * Whether to enable experimental parallel rewriting when SMAPI is loading mods. This can
+     * reduce startup time when you have many mods installed, but is experimental and may cause
+     * intermittent startup errors.
+     *
+     * When this is commented out, it'll be true for local debug builds and false otherwise.
+     */
+    //"RewriteInParallel": false,
+
     /**
      * Whether to add a section to the 'mod issues' list for mods which directly use potentially
      * sensitive .NET APIs like file or shell access. Note that many mods do this legitimately as
      * part of their normal functionality, so these warnings are meaningless without further
-     * investigation. When this is commented out, it'll be true for local debug builds and false
-     * otherwise.
+     * investigation.
+     *
+     * When this is commented out, it'll be true for local debug builds and false otherwise.
      */
     //"ParanoidWarnings": true,
 
     /**
-     * Whether SMAPI should show newer beta versions as an available update. When this is commented
-     * out, it'll be true if the current SMAPI version is beta, and false otherwise.
+     * Whether SMAPI should show newer beta versions as an available update.
+     *
+     * When this is commented out, it'll be true if the current SMAPI version is beta, and false
+     * otherwise.
      */
     //"UseBetaChannel": true,
 
diff --git a/src/SMAPI/SMAPI.csproj b/src/SMAPI/SMAPI.csproj
index c8b0e4cc..d9c98955 100644
--- a/src/SMAPI/SMAPI.csproj
+++ b/src/SMAPI/SMAPI.csproj
@@ -34,9 +34,9 @@
     <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>bin\Release\</OutputPath>
-<!--    <DefineConstants>TRACE;DEBUG;ANDROID_TARGET_GOOGLE</DefineConstants>-->
-<!--    <DefineConstants>TRACE;DEBUG;ANDROID_TARGET_SAMSUNG</DefineConstants>-->
-    <DefineConstants>TRACE;DEBUG;ANDROID_TARGET_GOOGLE;HARMONY_1</DefineConstants>
+<!--    <DefineConstants>ANDROID_TARGET_GOOGLE</DefineConstants>-->
+<!--    <DefineConstants>ANDROID_TARGET_SAMSUNG</DefineConstants>-->
+    <DefineConstants>ANDROID_TARGET_GOOGLE;HARMONY_1</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <LangVersion>8.0</LangVersion>
@@ -104,7 +104,13 @@
   </ItemGroup>
   <ItemGroup>
     <Reference Include="0Harmony">
-      <HintPath>..\Loader\libs\0Harmony.dll</HintPath>
+      <HintPath>..\..\build\0Harmony.dll</HintPath>
+    </Reference>
+    <Reference Include="MonoMod.RuntimeDetour">
+      <HintPath>..\Loader\libs\MonoMod.RuntimeDetour.dll</HintPath>
+    </Reference>
+    <Reference Include="MonoMod.Utils">
+      <HintPath>..\Loader\libs\MonoMod.Utils.dll</HintPath>
     </Reference>
     <Reference Include="MonoGame.Framework">
       <HintPath>..\Loader\libs\MonoGame.Framework.dll</HintPath>