New perf patch: ForceSyncSceneSwitch

GameData/KSPCommunityFixes/Settings.cfg

@@ -304,6 +304,10 @@ KSP_COMMUNITY_FIXES
   // Reduce scene loading time by caching the current save in memory instead of loading it from disk
   SceneLoadSpeedBoost = true
 
+  // Forces all scene transitions to happen synchronously.
+  // Mainly benefits highly modded installs by reducing asset cleanup run count from 3 to 1.
+  ForceSyncSceneSwitch = true
+
   // Prevent the buoyancy integrator from eating CPU cycles when the vessel isn't submerged
   OnDemandPartBuoyancy = true
 

KSPCommunityFixes/KSPCommunityFixes.csproj

@@ -128,6 +128,7 @@
     <Compile Include="Library\LocalizationUtils.cs" />
     <Compile Include="Library\ObjectPool.cs" />
     <Compile Include="Modding\ModUpgradePipeline.cs" />
+    <Compile Include="Performance\ForceSyncSceneSwitch.cs" />
     <Compile Include="Performance\AsteroidAndCometDrillCache.cs" />
     <Compile Include="BugFixes\DoubleCurvePreserveTangents.cs" />
     <Compile Include="BugFixes\RestoreMaxPhysicsDT.cs" />

KSPCommunityFixes/Performance/ForceSyncSceneSwitch.cs

@@ -0,0 +1,23 @@
+using HarmonyLib;
+using System;
+using System.Collections.Generic;
+
+namespace KSPCommunityFixes
+{
+    public class ForceSyncSceneSwitch : BasePatch
+    {
+        protected override void ApplyPatches(List<PatchInfo> patches)
+        {
+            patches.Add(new PatchInfo(
+                PatchMethodType.Prefix,
+                AccessTools.Method(typeof(SceneTransitionMatrix), "GetTransitionValue", new Type[] { typeof(GameScenes), typeof(GameScenes) }),
+                this));
+        }
+
+        static bool SceneTransitionMatrix_GetTransitionValue_Prefix(out bool __result)
+        {
+            __result = false;
+            return false;
+        }
+    }
+}

README.md

@@ -111,6 +111,7 @@ User options are available from the "ESC" in-game settings menu :<br/><img src="
 #### Performance tweaks 
 
 - **SceneLoadSpeedBoost** [KSP 1.8.0 - 1.12.5]<br/>Reduce scene switches loading time with large/modded saves by caching the current save in memory instead of loading it from disk.
+- [**ForceSyncSceneSwitch**](https://github.com/KSPModdingLibs/KSPCommunityFixes/pull/250) [KSP 1.12.0 - 1.12.5]<br/>Forces all scene transitions to happen synchronously. Mainly benefits highly modded installs by reducing asset cleanup run count from 3 to 1. 
 - **OnDemandPartBuoyancy** [KSP 1.8.0 - 1.12.5]<br/>Prevent the part buoyancy integrator from running when not needed. Improves performance for large part count vessels while in the SOI of a body that has an ocean (Kerbin, Eve, Laythe...)
 - [**FastLoader**](https://github.com/KSPModdingLibs/KSPCommunityFixes/issues/108) [KSP 1.12.3 - 1.12.5]<br/>Complete rewrite of the KSP asset/part loader : prevent GPU framerate limits from affecting loading speed, implement multithreaded asset loading (20% to 40% speedup depending on CPU & storage specs), provides an opt-in mechanism for caching PNG textures in the DXT5 format, also implements loading of additional DDS formats (see **BetterDDSSupport** patch in the API/modding tools section).
 - **PQSUpdateNoMemoryAlloc** [KSP 1.11.0 - 1.12.5]<br/> Prevent huge memory allocations and resulting occasional stutter on PQS creation happening when moving around near a body surface.
@@ -190,6 +191,9 @@ If doing so in the `Debug` configuration and if your KSP install is modified to
 
 ### Changelog
 
+##### 1.36.0
+- **SceneLoadSpeedBoost** : Reduce scene switch times further by forcing them to happen synchronously.
+
 ##### 1.35.2
 - **FastLoader** : Fixed a regression introduced in 1.35.1, causing PNG normal maps to be generated with empty mipmaps.