A patch about a month or two ago has really changed my League experience. When I try to play with sound enabled I only get 5 - 10 fps. When I disable sound I get 60 fps. I have not installed anything new, in fact, I un-installed windows 7 and reinstalled xp and it unfortunately didn't fix the problem.
I've tried buying a new sound card, different operating systems, multiple versions of drivers and nothing works. I have arrived at the conclusion that a patch released is what caused this problem.
I have currently been playing without sound for the last couple of months. Please help with this problem. This is the only game that give me issues with fps and sound.