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Now if you go to your left4dead folder (it's C:\Program Files (x86)\Steam\steamapps\common\left 4 dead\left4dead for me) you'll find filename.dem, which is the video you recorded.
To watch it you open L4D, open console and type "playdemo filename". Pressing shift+F2 opens up the demoui which allows you to pause, speed up, slow down, and you can also use the demo smoother and more.
I think doing it this way reduces lag because you're not using an outside program like Fraps to record a live game... But anyway, if you record using the demo recorder then you can use Fraps to record your demo at 30 fps and with the highest settings if your computer can handle it. I personally use Fraps but you can use whatever you want.
There are also a lot of useful commands you can use to hide parts of the HUD or everything on the HUD, remove glows, remove crosshair, hide chat/text, switch to thirdpersonshoulder, etc...
This is how I record all my videos.
Its really laggy