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by ZoFreX 5066 days ago
Bear in mind that Left 4 Dead 2 is still using DirectX 9! The exact performance issues they are having problems with are fixed in later versions, as well as them adding speed improvements in many other areas too. If they spent as much time optimizing the DirectX renderer as they have done with the OpenGL one (which, bear in mind, is hardly work from scratch either as it's in use on the PS3 and OS X versions of their games already) then the DirectX renderer would probably be out in front.