DisableMapOrbitsInFlight : Fix for #59

GameData/KSPCommunityFixes/Settings.cfg

@@ -191,9 +191,13 @@ KSP_COMMUNITY_FIXES
   PQSUpdateNoMemoryAlloc = true
 
   // Remove unused ProgressTracking update handlers. Provides a very noticeable performance uplift in 
-  // modded career games having a large amount of celestial bodies and many vessels.
+  // career games having a large amount of celestial bodies and/or vessels.
   ProgressTrackingSpeedBoost = true
 
+  // Disable the update of orbit lines and markers in flight when the map view isn't shown. Provides
+  // decent performance gains in games having a large amount of celestial bodies and/or vessels.
+  DisableMapOrbitsInFlight = true
+
   // Fix a bunch of managed memory leaks, mainly by proactively removing GameEvents delegates 
   // originating from destroyed UnityEngine.Object instances. Will log detected leaks and memory
   // usage on scene switches.

KSPCommunityFixes/KSPCommunityFixes.csproj

@@ -93,6 +93,7 @@
     <Compile Include="BasePatch.cs" />
     <Compile Include="BugFixes\AsteroidInfiniteMining.cs" />
     <Compile Include="BugFixes\EnginePlateAirstreamShieldedTopPart.cs" />
+    <Compile Include="Performance\DisableMapUpdateInFlight.cs" />
     <Compile Include="Performance\MemoryLeaks.cs" />
     <Compile Include="BugFixes\RescaledRoboticParts.cs" />
     <Compile Include="Modding\DepartmentHeadImage.cs" />

KSPCommunityFixes/Performance/DisableMapUpdateInFlight.cs

@@ -0,0 +1,26 @@
+// see https://github.com/KSPModdingLibs/KSPCommunityFixes/issues/59
+
+using System;
+using HarmonyLib;
+using System.Collections.Generic;
+
+namespace KSPCommunityFixes.Performance
+{
+    class DisableMapOrbitsInFlight : BasePatch
+    {
+        protected override Version VersionMin => new Version(1, 8, 0);
+
+        protected override void ApplyPatches(List<PatchInfo> patches)
+        {
+            patches.Add(new PatchInfo(
+                PatchMethodType.Prefix,
+                AccessTools.Method(typeof(OrbitRendererBase), nameof(OrbitRendererBase.LateUpdate)),
+                this));
+        }
+
+        static bool OrbitRendererBase_LateUpdate_Prefix()
+        {
+            return MapView.fetch.updateMap;
+        }
+    }
+}

README.md

@@ -90,7 +90,8 @@ User options are available from the "ESC" in-game settings menu :<br/><img src="
 - **TextureLoaderOptimizations** [KSP 1.10.0 - 1.12.3]<br/> Speedup loading time by caching on disk the PNG textures KSP converts to DXT5 on every launch. Also make PNG `@thumbs` cargo part textures non-readable to free some RAM. This patch has no entry in `settings.cfg`, but is opt-in (a popup is shown on first KSP launch) and can be disabled latter in the in-game settings menu.
 - **PQSUpdateNoMemoryAlloc** [KSP 1.11.0 - 1.12.3]<br/> Prevent huge memory allocations and resulting occasional stutter on PQS creation happening when moving around near a body surface.
 - [**MemoryLeaks**](https://github.com/KSPModdingLibs/KSPCommunityFixes/issues/49) [KSP 1.12.0 - 1.12.3]<br/>Fix a bunch of managed memory leaks, mainly by proactively removing `GameEvents` delegates originating from destroyed `UnityEngine.Object` instances on scene switches. Will log detected leaks and memory usage. Also see`Settings.cfg` to enable advanced logging options that can be useful to hunt down memory leaks in mods.
-- [**ProgressTrackingSpeedBoost**](https://github.com/KSPModdingLibs/KSPCommunityFixes/pull/57) [KSP 1.12.0 - 1.12.3]<br/>Remove unused ProgressTracking update handlers. Provides a very noticeable performance uplift in modded career games having a large amount of celestial bodies and many vessels.
+- [**ProgressTrackingSpeedBoost**](https://github.com/KSPModdingLibs/KSPCommunityFixes/pull/57) [KSP 1.12.0 - 1.12.3]<br/>Remove unused ProgressTracking update handlers. Provides a very noticeable performance uplift in career games having a large amount of celestial bodies and/or vessels.
+- [**DisableMapOrbitsInFlight**](https://github.com/KSPModdingLibs/KSPCommunityFixes/issues/59) [KSP 1.8.0 - 1.12.3]<br/>Disable the update of orbit lines and markers in flight when the map view isn't shown. Provides decent performance gains in games having a large amount of celestial bodies and/or vessels.
 
 #### API and modding tools
 - **MultipleModuleInPartAPI** [KSP 1.8.0 - 1.12.3]<br/>This API allow other plugins to implement PartModules that can exist in multiple occurrence in a single part and won't suffer "module indexing mismatch" persistent data losses following part configuration changes. [See documentation on the wiki](https://github.com/KSPModdingLibs/KSPCommunityFixes/wiki/MultipleModuleInPartAPI).
@@ -137,6 +138,7 @@ If doing so in the `Debug` configuration and if your KSP install is modified to
 ### Changelog
 
 ##### 1.19.0
+- New performance patch : [DisableMapOrbitsInFlight](https://github.com/KSPModdingLibs/KSPCommunityFixes/issues/59) (contributed by @JonnyOThan)
 - New performance patch : [ProgressTrackingSpeedBoost](https://github.com/KSPModdingLibs/KSPCommunityFixes/pull/57) (contributed by @JonnyOThan)
 - New QoL patch : [ToolbarShowHide](https://github.com/KSPModdingLibs/KSPCommunityFixes/pull/53) (contributed by @NathanKell)
 - New QoL patch : ResourceLockActions