1. If your devices (video card, CPU) are over-clocked,  set them to their defaults.

  2. Re-install your video drivers (with a clean install option, if available).

  3. Close all unnecessary applications working in the background before running the game.

  4. Verify the integrity of game cache from Steam and turn-off VSync from the configuration file.

  5. If the problem persists, try re-installing the Game.