Same exact problem, but mine picked up when I installed the 1.3 gb patch this morning. Just earlier this morning before the update, I was perfectly fine. However, I've been having a persistent crash problem with my .dll files. Previous to this patch, I had to clear my .dll folder to prevent a crash 10 minutes into gameplay. Now, if I keep my .dll files I can barely load into a server before I crash. However, keeping my .dll files clear seems to now have caused the ~4 fps problem instead of crashing.