Left 4 Dead 2 Tips

I have found a couple of links to help the community here with there framerate and issues.  I know these links were made by PC users, but some of the content they supply could also be helpful in crossover.  The second set of links mainly are problems with the game, not problems with crossover.

Descriptions of what the settings mean in-game and how to adjust them correctly, how to increase your fps, and alternative tweaks you can do with the game. (link below)

http://www.nextlevelgamer.com/left-4-dead/left-4-dead-performance-guide
 
These links below are from a forum post on the steam forums.  The posts describe bugs/glitches that are currently in the left 4 dead 2.  If you are encountering these problems listed below, your not the only one nor it's not crossover's fault.  Valve is doing there best to fix them. (links below)

http://forums.steampowered.com/forums/showpost.php?p=12063392&postcount=1

http://forums.steampowered.com/forums/showpost.php?p=12063497&postcount=2

Please edit if you have any other useful sources to help users with left 4 dead 2.