diff --git a/binaries/system/readme.txt b/binaries/system/readme.txt
index 70cc49a9fd..120ba8ba6c 100644
--- a/binaries/system/readme.txt
+++ b/binaries/system/readme.txt
@@ -88,6 +88,9 @@ Advanced / diagnostic:
 -hashtest-full=X    whether to enable computation of full hashes in replaymode (default true). Can be disabled to improve performance.
 -hashtest-quick=X   whether to enable computation of quick hashes in replaymode (default false). Can be enabled for debugging purposes.
 
+-fixed-frame-frequency=F fixes the frame time. With that flags it equals to 1/F. For example,
+                         if F=60 it means the game behaves like it's always running with 60 FPS.
+
 Archive builder:
 -archivebuild=PATH            system PATH of the base directory containing mod data to be archived/precached
                                 specify all mods it depends on with -mod=NAME
diff --git a/source/main.cpp b/source/main.cpp
index 9924eb5249..a8dc337589 100644
--- a/source/main.cpp
+++ b/source/main.cpp
@@ -362,7 +362,7 @@ static void RendererIncrementalLoad()
 	while (more && timer_Time() - startTime < maxTime);
 }
 
-static void Frame(RL::Interface* rlInterface)
+static void Frame(RL::Interface* rlInterface, const int fixedFrameFrequency)
 {
 	g_Profiler2.RecordFrameStart();
 	PROFILE2("frame");
@@ -382,7 +382,8 @@ static void Frame(RL::Interface* rlInterface)
 
 	// .. new method - filtered and more smooth, but errors may accumulate
 #else
-	const float realTimeSinceLastFrame = 1.0 / g_frequencyFilter->SmoothedFrequency();
+	const float realTimeSinceLastFrame{static_cast<float>(
+		1.0 / (fixedFrameFrequency > 0 ? fixedFrameFrequency : g_frequencyFilter->SmoothedFrequency()))};
 #endif
 	ENSURE(realTimeSinceLastFrame > 0.0f);
 
@@ -531,6 +532,9 @@ static void RunGameOrAtlas(const PS::span<const char* const> argv)
 	const bool isNonVisualReplay = args.Has("replay");
 	const bool isVisual = !args.Has("autostart-nonvisual");
 
+	const int fixedFrameFrequency{args.Has("fixed-frame-frequency")
+		? args.Get("fixed-frame-frequency").ToInt() : 0};
+
 	const OsPath replayFile(
 		isVisualReplay ? args.Get("replay-visual") :
 		isNonVisualReplay ? args.Get("replay") : "");
@@ -695,7 +699,7 @@ static void RunGameOrAtlas(const PS::span<const char* const> argv)
 		while (g_Shutdown == ShutdownType::None)
 		{
 			if (isVisual)
-				Frame(rlInterface ? &*rlInterface : nullptr);
+				Frame(rlInterface ? &*rlInterface : nullptr, fixedFrameFrequency);
 			else if(rlInterface)
 				rlInterface->TryApplyMessage();
 			else