Lag/Frame Rate Issues since Patch 4.20

I have been playing League for over a year now without any problems connection or performance wise. Ever since the release of patch 4.2, I have been experience lag spikes causing my screen to freeze and also a loss of 30 frames per second. This occurs simultaneously for about 3 seconds on average, and then things go back to normal, but this spike happens about 3 times every 5 minutes. I would say that my computer or internet was the issue however, i can play all my other games no problem and they are a lot more taxing on my computer than league is. This leads me to believe that the problem is not on my end, and reading other posts shows me that other people seem to be experiencing the same issue. Not too long ago there was a bugfix that said it fixed lag issues in game, but my game if anything has only gotten worse. Please help.