it doesn't peg the cpu unless you have no GPU 2D acceleration. However if you do have that it most likely triggers your gpu's thermal stuff to fire up the cooling fans at high speed. I too hate this background on all forums that run it. However in the end, it's the site admin's decision. Not ours.
http://forum.ppcgeeks.com/snow.js is the script... you might be able to block it like the next guy...
