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So after the "hud animation" patch i noticed that i started to get massive fps drops in teamfights. After repairing lol, downloading new drivers to my graphic card and doing maxing my use of the computer memory (see other threads about this), I decided to reinstall my computer.
At the start everything seemed to be back to a normal and lag free league but soon i noticed the huge fps drops once again in teamfights.
I then checked all my updates and found out that the only thing I had left to upgrade was my BIOS, wich I did. Now after a cupple of games it seems to have done the trick.