Praveen926 :
You need to mention your config details. Reduce your settings to reduce the lag and play smoothly. If still, then try 900p. That would be okay
Processor: AMD FX(tm)-6100 Six-Core Processor (6 CPUs), ~3.3GHz
GPU: Two GTX550Tis (sli)
OS: Windows 7
8GB RAM
I've put everything on normal, I think it has something to do with the game originally not supporting sli. I think it eats my memory as well.