Awful Online FPS

(PC Steam Version) Me and my friend had been playing offline USFIV for a while now (60FPS no problem) and we decided to go against each other online, wejoined fine but when the match started it played at best 20FPS and constantly dipped to 5-10FPS, I resarched and quickly found this was a common problem.
I was just wondering if there is any fan made patches or easy solution to fix this? Thanks