I need to very precisely control the rate at which images are drawn.  Think something along the lines of subliminal messages -- a very brief flash.

Ideally, I need something in the 10ms range (so 100 FPS).  But this really needs only to occur for a single frame (so 10ms of one image, 990ms of another).  

I've tried boosting the FPS count, but that doesn't work reliably.

I also tried the following:

image(IMAGEONE, 0, 0);
delay(100);
image(IMAGETWO, 0, 0);

But that never seems to render the first image, no matter how long I make the delay.  I have a suspicion this is because it's rendering to the frame buffer (processing is double buffered by default I assume), so everything appears all at once when draw() returns.

I'm hoping someone has some ideas on how to do very quick "flashes" of images.

Help much appreciated,
Chris