Masking with random shapes

When I publish this flash site of mine online and view it, it seems to move slow and choppy but I really can’t tell if it’s just my weak computer or too much going on (dozens of simple shapes acting as a mask layer, at random rates). In the intro of my site, once it’s loaded the background gets masked in and it’s the mask I’m checking out and working on right now:

www.briotron.com/index_2.html

www.briotron.com

I’ve seen this animated at the intended speed on others’ computers, mainly clients’ or potential employers with better computers but I just want to make sure it’s not really acting this slow on most other people’s computers, so if you’re able to give me input on this I’d appreciate it. I have no other computers around me now that I can check this with