Program slows down system

[Mox]

Hi you all,

I've got a problem and I've tried everything to fix it, or even to see what is wrong. It's like this: the messages of the window are slow. Or for that matter, my whole program slows everything else down, including itself.
It's really weird because I've made more programs like this one that work fine. I've tried them out just now and they still work.

They are game (simple game) programs that for now just draw something. I use the following game loop:

	while (true)
	{
		if (PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE))
		{
			if (GetMessage(&msg, NULL, 0, 0))
			{
				TranslateMessage(&msg);
				DispatchMessage(&msg);
			}
			else
				break;
		}
		else
			DoGame();
	}

I have this in both programs (one works, the other is slow). I use DirectX in both and blt in the same way in both. But one slows down the system and the other doesn't.
What could be wrong here? (or do you know of anything that could cause this?)
BTW if I do nothing in DoGame() the slow program works fine...

(By slowing the system I mean, everything is slowed down, clicking, pressing a button (also ALT-F4), dragging the window, showing other windows, etc)

Joren

[Mox]

Hi again,

what I have to add, is that when I almost draw nothing in the app that did work, the same thing happens. I only clear the backbuffer and blt it to the screen. This doesn't take too long (a couple of microsecons or so ) so the framerate is sky high.
Could this cause the system to slow down. Is the message loop traversed so fast that it can't get the messages or something? I would think that if the program doesn't do much in the DoGame() it would be good. But maybe because it only does DirectDraw things which stall the system (does it?), it can't get the messages?
Should I therefor slow down the framerate? I wanted to keep it as high as possible...
Or could something else be wrong???

Joren