Im not sure why this is, but the game runs insanely smooth in Infected. The game stays locked on 60 almost 100% of the time in this game mode. Stonehaven is the only map that still chugs a little, but the rest run insanely fast. I dont know what the cause of this is, but you may want to look at the reasons, and see if this helps provide optimizations for TDM. Its insane guys, if you havent played Infected yet, go check it out, it runs phenomenal. If Treyarch could get TDM to run as smooth as Infected I would be one happy camper.