FPS drops to 3 (Battlefield: Bad Company 2)

Guys, can someone faced with such a problem.

Played a long time like that on the GTX 560 Ti, everything worked perfectly, it was worth to change for a GTX 760, and began a terrible lag. Every 10 minutes the FPS drops to 3, and last is 5 seconds approximately. Now I have a GTX 1060, and the problem remained, the feeling that the modern vidyuhi lag.
On the second comp is GTX 760, and on two computers these logs.