EG's footer... how does it not lag?

How does EG’s footer not cause an fps problem? I made 7 little fuzzy flowing balls… and if anymore… it lags my computer, how come?
I’m not exactly sure how to ask the question… but that’s all i can do.

The footer is probably made with actionscript.

I believe EG did what Sharif mentioned above, but don’t quote me though, I might be wrong.