Index: src/Cube.mm
==================================================================
--- src/Cube.mm
+++ src/Cube.mm
@@ -196,11 +196,14 @@
 	// if this map is changed, also change depthcorrect()
 	changemap(@"metl3");
 
 	log(@"mainloop");
 	int ignore = 5;
+	OFDate *past = [OFDate date];
 	for (;;) {
+		[OFRunLoop.mainRunLoop runUntilDate:past];
+
 		int millis = SDL_GetTicks() * gamespeed / 100;
 		if (millis - lastmillis > 200)
 			lastmillis = millis - 200;
 		else if (millis - lastmillis < 1)
 			lastmillis = millis - 1;