My FPS has been dropping a lot lately, as well. Each update takes off a big chunk of my frames.
The cf is the problem. I have lost 10 frames too after the emergency patch. Also they have a chunk of firewall opened. (I was looking around and the firewall for DDoS's, and Virus Inserts are not working) I received a worm today also. But try CCleaner, i't works or GameBooster
Gamebooster link broken here it is w/w/w/.i//o//b//i//t//./c/o/m/gamebooster.html (take out the /)