The game freeze (Tom Clancy's Rainbow Six: Siege)

Much of the game, if you run parallel to deep, and it also proposes a voice, hear them jerks. And the game lags is that I turn my mouse in any direction, and the game turn is two times slower. Before such was not. Deep re-installed, Windows new. When running the game program, the CPU load around 60%, RAM 8 GB and uses about 5.8 GB. As soon As the close, the lag immediately disappears. What's the problem? May come across someone with a similar.