Valve ported Left 4 Dread 2 to Linux and it run faster than on windows, read more about it here.
http://blogs.valvesoftware.com/linux/faster-zombies/
Im pretty sure we will see cryengine ported for linux very soon, as you can read there the hardware vendors has helped alot with the driver performance and im pretty sure other game developers will have a easier way to port than valve did and since Linux is a free OS alot of people and companys would have alot to win on having games running on Linux.
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