Here's a quick tip, I found I get smoother gameplay and higher fps if you play in windowed mode. I think in-game you open console and type /cg_fullscreen 1 or something like that. Just type fullscreen in the command line and it'll show the command. Once you've entered it, close console and the game, then reopen it. From there, just tweak your graphics settings starting from the lowest resolution and work your way up till you find the optimal settings