It took less than 2 minutes for that page to put my workstation-class graphics card up over 10 degrees C with the fans at 100% and audible from the next room.

That's not a good sign.

Particle tests are a dime a dozen. You could have seen the same things in Flash 10 years ago.

BTW I'm on a Mac viewing your (66k polygons) example in Chrome - and my fans started spinning almost a few seconds after opening your link. Five of those running in parallel and my laptop would probably explode.

GPU seems to be going crazy - http://i.imgur.com/t4qC0LJ.png