I didn't mean to scare anyone. I put 30 of the same icon on a computer with 700mhz and 128mb ram (that's a very old system for those of you who don't know). I got no speed reduction at all. I put it on an old 500mhz one though and it increased startup time by 10 minutes! Anyway, for 99% of you, these icons won't be a problem. Action9000's case is a little unique. He actually does important stuff on his system that takes up a LOT of power and speed. I can see why he doesn't want them on his desktop. If I were him, I wouldn't either.
Anyway, I just wanted to say that I don't want you to be frightened of downloading these icons thinking it'll slow your computer down to crap. It won't unless you have a really old system or you do a lot of stuff like Action9000.
Here's the icon on my desktop BTW:

As you can see, my desktop's a mess again. LOL.