Well I can surely say it does speed up the applications FPS. BUT, on aion it lag backs to the spot you should be.
Example, running normally forward, then speed it up, your notice its fast on your screen but lags back every 1-second to where you would (should) be on aion servers.
Btw, Don't use over 3,000. It crashes aion. I'm guessing like me you jacked it to max first time? Aion crashes at that.
I'm using 64bit Vista at 3,000 speed.
I recommend those with 32bit use 1,500 speed. Just test and see if this works.