I had a little weird problem.
At first: i have very old PC:
Processor: 1x 3.00 GHz
RAM: 1GB
Graphic: GeForce TI 4200 with AGP 128 MB

I was earlier using a 4.31 TB version and everything was ok. I had mostly around 50-60 FPS all the time.
Now i have around 7-10 FPS. NO MATTER what version i'll install. I even check 3.69. And still same.
Anyone know what is going on? I have same hardware as earlier and similiar (latest for my PC) drivers.
Earlier i had no problem with any of tb version.

Now i can't play and have no idea what to do.
Any suggestions?

Did you update your drivers?

Check what your settings are on and maybe turn them down. If you need to try using Razor game booster: http://www.razerzone.com/gb-en/gamebooster