diff --git a/GameData/KSPCommunityFixes/Settings.cfg b/GameData/KSPCommunityFixes/Settings.cfg
index e6d4d44..5bc50e5 100644
--- a/GameData/KSPCommunityFixes/Settings.cfg
+++ b/GameData/KSPCommunityFixes/Settings.cfg
@@ -284,6 +284,14 @@ KSP_COMMUNITY_FIXES
   // Invert the editor undo state capturing logic so part tweaks aren't lost when undoing.
   BetterEditorUndoRedo = true
 
+  // Allow to disable the Making History DLC mission editor and additional launch sites features
+  // to decrease memory usage and increase loading speed. The Making History parts will still be 
+  // available. Can be toggled from the KSPCF in-game settings (requires a restart).
+  OptionalMakingHistoryDLCFeatures = true
+
+  // Optional MM-patcheable toggle to always disable the MH features
+  OptionalMakingHistoryDLCFeaturesAlwaysDisable = false
+
   // ##########################
   // Performance tweaks
   // ##########################
diff --git a/KSPCommunityFixes/Internal/PatchSettings.cs b/KSPCommunityFixes/Internal/PatchSettings.cs
index d75af1d..7add0b1 100644
--- a/KSPCommunityFixes/Internal/PatchSettings.cs
+++ b/KSPCommunityFixes/Internal/PatchSettings.cs
@@ -18,6 +18,7 @@ class PatchSettings : BasePatch
         private static int entryCount = 0;
         private static AltimeterHorizontalPosition altimeterPatch;
         private static DisableManeuverTool maneuverToolPatch;
+        private static OptionalMakingHistoryDLCFeatures disableMHPatch;
 
         protected override void ApplyPatches(List<PatchInfo> patches)
         {
@@ -39,6 +40,10 @@ protected override void ApplyPatches(List<PatchInfo> patches)
             if (maneuverToolPatch != null)
                 entryCount++;
 
+            disableMHPatch = KSPCommunityFixes.GetPatchInstance<OptionalMakingHistoryDLCFeatures>();
+            if (disableMHPatch != null)
+                entryCount++;
+
             if (KSPCFFastLoader.IsPatchEnabled)
             entryCount++;
 
@@ -61,6 +66,22 @@ static void GameplaySettingsScreen_DrawMiniSettings_Postfix(ref DialogGUIBase[]
             modifiedResult[count] = new DialogGUIBox(KSPCommunityFixes.LOC_KSPCF_Title, -1f, 18f, null);
             count++;
 
+            if (disableMHPatch != null)
+            {
+                DialogGUIToggle toggle = new DialogGUIToggle(OptionalMakingHistoryDLCFeatures.isMHEnabled,
+                    () => (!OptionalMakingHistoryDLCFeatures.isMHEnabled)
+                        ? Localizer.Format("#autoLOC_6001071") //"Disabled"
+                        : Localizer.Format("#autoLOC_6001072"), //"Enabled"
+                    b => OptionalMakingHistoryDLCFeatures.isMHEnabled = b, 150f);
+                toggle.tooltipText = OptionalMakingHistoryDLCFeatures.LOC_SettingsTooltip;
+                toggle.OptionInteractableCondition = () => !OptionalMakingHistoryDLCFeatures.isMHDisabledFromConfig;
+
+                modifiedResult[count] = new DialogGUIHorizontalLayout(TextAnchor.MiddleLeft,
+                    new DialogGUILabel(() => Localizer.Format(OptionalMakingHistoryDLCFeatures.LOC_MHDLC), 150f), //"Maneuver Tool"
+                    toggle, new DialogGUIFlexibleSpace());
+                count++;
+            }
+
             if (maneuverToolPatch != null)
             {
                 DialogGUIToggle toggle = new DialogGUIToggle(DisableManeuverTool.enableManeuverTool,
@@ -120,6 +141,13 @@ static void GameplaySettingsScreen_DrawMiniSettings_Postfix(ref DialogGUIBase[]
 
         static void GameplaySettingsScreen_ApplySettings_Postfix()
         {
+            if (disableMHPatch != null)
+            {
+                ConfigNode node = new ConfigNode();
+                node.AddValue(nameof(OptionalMakingHistoryDLCFeatures.isMHEnabled), OptionalMakingHistoryDLCFeatures.isMHEnabled);
+                SaveData<OptionalMakingHistoryDLCFeatures>(node);
+            }
+
             if (maneuverToolPatch != null)
             {
                 ConfigNode node = new ConfigNode();
diff --git a/KSPCommunityFixes/KSPCommunityFixes.csproj b/KSPCommunityFixes/KSPCommunityFixes.csproj
index 0b27596..1ffe9e8 100644
--- a/KSPCommunityFixes/KSPCommunityFixes.csproj
+++ b/KSPCommunityFixes/KSPCommunityFixes.csproj
@@ -174,6 +174,7 @@
     <Compile Include="Performance\ProgressTrackingSpeedBoost.cs" />
     <Compile Include="QoL\AutostrutActions.cs" />
     <Compile Include="QoL\BetterEditorUndoRedo.cs" />
+    <Compile Include="QoL\OptionalMakingHistoryDLCFeatures.cs" />
     <Compile Include="QoL\ToolbarShowHide.cs" />
     <Compile Include="QoL\DisableNewGameIntro.cs" />
     <Compile Include="QoL\NoIVA.cs" />
diff --git a/KSPCommunityFixes/QoL/OptionalMakingHistoryDLCFeatures.cs b/KSPCommunityFixes/QoL/OptionalMakingHistoryDLCFeatures.cs
new file mode 100644
index 0000000..6d9c23f
--- /dev/null
+++ b/KSPCommunityFixes/QoL/OptionalMakingHistoryDLCFeatures.cs
@@ -0,0 +1,72 @@
+using System;
+using Expansions;
+using HarmonyLib;
+using System.Collections;
+using System.Collections.Generic;
+using System.IO;
+
+namespace KSPCommunityFixes.QoL
+{
+    internal class OptionalMakingHistoryDLCFeatures : BasePatch
+    {
+        private const string MH_EXPANSION_FILE = "makinghistory.kspexpansion";
+        private const string SETTINGS_TOGGLE_VALUE_NAME = "OptionalMakingHistoryDLCFeaturesAlwaysDisable";
+        internal static string LOC_MHDLC = "Making History features";
+        internal static string LOC_SettingsTooltip = "Disable the Making History DLC mission editor and additional launch sites\nThe Making History parts will still be available\nWill reduce memory usage and increase loading speed\nChanges will take affect after restarting KSP";
+        internal static bool isMHEnabled = true;
+        internal static bool isMHDisabledFromConfig = false;
+
+        protected override Version VersionMin => new Version(1, 12, 3);
+
+        protected override void ApplyPatches(List<PatchInfo> patches)
+        {
+            if (KSPCommunityFixes.SettingsNode.TryGetValue(SETTINGS_TOGGLE_VALUE_NAME, ref isMHDisabledFromConfig) && isMHDisabledFromConfig)
+                isMHEnabled = false;
+
+            patches.Add(new PatchInfo(
+                PatchMethodType.Prefix,
+                AccessTools.Method(typeof(ExpansionsLoader), nameof(ExpansionsLoader.InitializeExpansion)),
+                this));
+        }
+
+        protected override void OnLoadData(ConfigNode node)
+        {
+            if (!isMHDisabledFromConfig)
+                node.TryGetValue(nameof(isMHEnabled), ref isMHEnabled);
+        }
+
+        protected override bool CanApplyPatch(out string reason)
+        {
+            if (Directory.Exists(KSPExpansionsUtils.ExpansionsGameDataPath))
+            {
+                foreach (string fileName in Directory.GetFiles(KSPExpansionsUtils.ExpansionsGameDataPath, "*" + ExpansionsLoader.expansionsMasterExtension, SearchOption.AllDirectories))
+                {
+                    if (fileName.EndsWith(MH_EXPANSION_FILE))
+                    {
+                        reason = null;
+                        return true;
+                    }
+                }
+            }
+
+            reason = "Making History DLC not installed";
+            return false;
+        }
+
+        static bool ExpansionsLoader_InitializeExpansion_Prefix(string expansionFile, ref IEnumerator __result)
+        {
+            if (!isMHEnabled && expansionFile.EndsWith(MH_EXPANSION_FILE))
+            {
+                __result = EmptyEnumerator();
+                return false;
+            }
+
+            return true;
+        }
+
+        static IEnumerator EmptyEnumerator()
+        {
+            yield break;
+        }
+    }
+}
diff --git a/README.md b/README.md
index 595aa4a..7a2b19e 100644
--- a/README.md
+++ b/README.md
@@ -105,6 +105,7 @@ User options are available from the "ESC" in-game settings menu :<br/><img src="
 - [**ToolbarShowHide**](https://github.com/KSPModdingLibs/KSPCommunityFixes/pull/53) [KSP 1.8.0 - 1.12.5]<br/>Add a button for hiding/showing the stock toolbar. Also allow accessing the toolbar while in the space center facilities windows (mission control, admin building, R&D...).
 - **ResourceLockActions** [KSP 1.8.0 - 1.12.5]<br/>Add part actions for locking/unlocking resources flow state.
 - [**BetterEditorUndoRedo**](https://github.com/KSPModdingLibs/KSPCommunityFixes/issues/172) [KSP 1.12.3 - 1.12.5]<br/>Invert the editor undo state capturing logic so part tweaks aren't lost when undoing.  NOTE: this patch is disabled when TweakScale/L is installed.
+- [**OptionalMakingHistoryDLCFeatures**](https://github.com/KSPModdingLibs/KSPCommunityFixes/issues/218) [KSP 1.12.3 - 1.12.5]<br/>Allow to disable the Making History DLC mission editor and additional launch sites features to decrease memory usage and increase loading speed. The Making History parts will still be available. Can be toggled from the KSPCF in-game settings (requires a restart), or from a MM patch (see `Settings.cfg`).
 
 #### Performance tweaks 
 
@@ -188,6 +189,9 @@ If doing so in the `Debug` configuration and if your KSP install is modified to
 
 ### Changelog
 
+##### next
+- New KSP QoL/performance patch : [**OptionalMakingHistoryDLCFeatures**](https://github.com/KSPModdingLibs/KSPCommunityFixes/issues/218) [KSP 1.12.3 - 1.12.5] : Allow to disable the Making History DLC mission editor and additional launch sites features to decrease memory usage and increase loading speed. The Making History parts will still be available. Can be toggled from the KSPCF in-game settings (requires a restart), or from a MM patch (see `Settings.cfg`)
+
 ##### 1.34.1
 - Disable BetterEditorUndoRedo when TweakScale/L is installed due to introducing a bug with part attachments in the editor.