Annoying FPS Problem

[Bean (DayZ) 1]

Alright, so, I updated to this most recent 1.7.2.5 patch, and everything was working great. Was all good. Then, my gaming community hosts a server, and I was going to play on it, and I forgot that they were still on the 1.7.2.4 patch, so I had to downgrade. I kept backups of the old patch, so I simply just overwrote the files from the newer patch, so that I could play. As soon as I logged on, I began to expirience -terrible- FPS lags. Like, I would walk a few feet, normally, then the game would just hang for about six seconds, afterwards allowing me to move again for a brief amount of time.

I began to troubleshoot myself, first, I lowered all of my video settings to the lowest they could be, ended all background programs, things like that.

I thought, eh, it may just be because I already updated the patch before this, so I just decided to fuck it, and then switched back to the newer patch. Then, when I went to play on that patch, it began to do the same FPS glitch. And it isn't a specific server, because even on the main menu, it would run for a few seconds, and then hang. And it just started doing this, after I switched to the 1.7.2.4 patch, and is still doing it after I switched back to the 1.7.2.5 patch.

Any suggestions would be much appreciated.