S!
Can't deny or prove the OP's claim, but atleast the Steam screenshot button (F12) causes a freeze in the game that lasts about one second. I think that this would cause some induced lag too.
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AMD 1055T Hexacore@3,4GHz - 2x4GB 1600MHz DDR3 - ATI 6950 2GB, flashed to 6970 shaders - Windows 7 Ultimate 64-bit - 30" LG W3000H (2560x1600) - TM Warthog Stick + Cougar Throttle - wooden DIY pedals with Hall sensor - FreeTrack
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