Quote from Kblavkalash
Thanks for advice Primo. Gonna try to decrease resolution and check if lag remains. Also, how do I check CPU usage while playing? Because if I alt-tab CPU usage instantly decreases and I don't have double monitor.
You have 3 options to check the CPU usage:
1) Check the Task Manager's graphs for each core and estimate what was the CPU usage just before you alt-tabbed;
2) Play in windowed mode ( =P );
3) Use HWiNFO with Riva Tuner OSD to display the CPU usage in real time while in fullscreen mode. This link explains it in more details http://forum.techinferno.com/hwinfo32-64-discussion/616-support-rtss-displaying-hwinfo32-64-sensor-values-games.html.