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

2. Please 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.