diff --git a/source/Applewin.cpp b/source/Applewin.cpp
index 26aaa8c6..b7423717 100644
--- a/source/Applewin.cpp
+++ b/source/Applewin.cpp
@@ -232,6 +232,9 @@ void ContinueExecution(void)
 
 	if (g_bFullSpeed)
 	{
+		if (!bWasFullSpeed)
+			VideoRedrawScreenDuringFullSpeed(0, true);	// Init for full-speed mode
+
 		// Don't call Spkr_Mute() - will get speaker clicks
 		MB_Mute();
 		SysClk_StopTimer();
@@ -249,7 +252,6 @@ void ContinueExecution(void)
 	{
 		if (bWasFullSpeed)
 		{
-			VideoRedrawScreenDuringFullSpeed(0, true);	// Invalidate the copies of video memory
 			VideoRedrawScreenAfterFullSpeed(g_dwCyclesThisFrame);
 		}
 
diff --git a/source/Video.cpp b/source/Video.cpp
index b38fdfa3..191fca27 100644
--- a/source/Video.cpp
+++ b/source/Video.cpp
@@ -1052,16 +1052,25 @@ void VideoDisplayLogo ()
 // . 10s only update if HIRES changes (17s for Debug build)
 // . ~9s no update during full-speed (but IBIZA.DSK doesn't show anything!)
 
-void VideoRedrawScreenDuringFullSpeed(DWORD dwCyclesThisFrame, bool bInvalidate /*=false*/)
+void VideoRedrawScreenDuringFullSpeed(DWORD dwCyclesThisFrame, bool bInit /*=false*/)
 {
+	static DWORD dwFullSpeedStartTime = 0;
 	static bool bValid = false;
 
-	if (bInvalidate)
+	if (bInit)
 	{
+		// Just entered full-speed mode
 		bValid = false;
+		dwFullSpeedStartTime = GetTickCount();
 		return;
 	}
 
+	DWORD dwFullSpeedDuration = GetTickCount() - dwFullSpeedStartTime;
+	if (dwFullSpeedDuration <= 16)	// Only update after every realtime ~17ms of *continuous* full-speed
+		return;
+
+	dwFullSpeedStartTime += dwFullSpeedDuration;
+
 	//
 
 	static BYTE text_main[1024*2] = {0};	// page1 & 2
diff --git a/source/Video.h b/source/Video.h
index 29cee8d8..8190b8fe 100644
--- a/source/Video.h
+++ b/source/Video.h
@@ -169,7 +169,7 @@ void    VideoDestroy ();
 void    VideoDisplayLogo ();
 void    VideoInitialize ();
 void    VideoRealizePalette (HDC);
-void    VideoRedrawScreenDuringFullSpeed(DWORD dwCyclesThisFrame, bool bInvalidate = false);
+void    VideoRedrawScreenDuringFullSpeed(DWORD dwCyclesThisFrame, bool bInit = false);
 void    VideoRedrawScreenAfterFullSpeed(DWORD dwCyclesThisFrame);
 void    VideoRedrawScreen (UINT uDelayRefresh = 0);
 void    VideoRefreshScreen (int bVideoFlags, UINT uDelayRefresh =0 );