Recording with Fraps will shoot down your FPS a little even on a really good setup, what I recommend that you do is that you record a demo ("record <demoname>" in console), and then once you are done recording the demo use "stop record" to stop recording the demo, the "map <demoname>.dm2" to play the demo, and start up fraps and record your demo being played back, this way fraps won't kill your gameplay.