--- a/tong.cpp.orig
+++ b/tong.cpp
@@ -64,6 +64,8 @@
 
 #define DEMO_TIME           8000
 
+#define MIN_TIME            45
+
 #define GP2X_BUTTON_UP         0
 #define GP2X_BUTTON_UPLEFT     1
 #define GP2X_BUTTON_LEFT       2
@@ -1854,6 +1856,13 @@
 		SDL_Flip(screen);
 		lastlastupdate=lastupdate;
 		lastupdate=SDL_GetTicks();
+
+		// limit to 1000/MIN_TIME fps
+		if (lastupdate-lastlastupdate < MIN_TIME) {
+			SDL_Delay(MIN_TIME - (lastupdate - lastlastupdate));
+		}
+		lastupdate = SDL_GetTicks();
+
 	}  //main game loop
 
 	Mix_FreeMusic(music);