I am also experiencing degraded performance with Unreal Tournament 3 and the latest Catalyst 9.9 drivers. I am running Windows 7 Ultimate 6.1 (Build 7600). My primary display is a Dell 2407WFP and the secondary display is a nanovision Mimo. My graphics card is a XFX Radeon HD 4890.
Let me know if I can be of assistance in testing any new versions.
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