First things first:
CHECK THE GAME'S MINIMUM SYSTEM REQUIREMENTS!!
Each of our games' product pages post the requirements, so compare them to your computer specs.
Q: How can I check my specs?
A: Mac folks,
Check your system profile:
Running on Windows,
Check your dxdiag:
If your computer meets the posted system requirements for the Steam game and you're still experiencing performance issues and crashing, VERIFY THE GAME CACHE INTEGRITY:
9 times out of 10, this should do the trick!