Total problem with DLC for Shift 2 Unleashed (Shift 2: Unleashed)

Good day.
The problem is that when I launched just a pure shift without dlc, it flies and no glitches ... And then, I installed dlc and when I start it, everything just slows down and the sound is interrupted, in general, it's impossible to play. Changing graphics settings doesn't help.
If anyone needs I can then attach a video with this nightmare.