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When you play games in fullscreen, your FPS will be hit right? I tried playing DDS the other day in fullscreen and non-fullscreen and it seems to lag less when not in fullscreen. I just need a confirmation of that fact. Thanks!

(Oh and if anyone knows how to resolve the issue of Tales of the Abyss being darker when using GSDX9... [This is the only GSDX where there is no ghosting effect])

Speed should be the same. I guess you're experiencing some conflict with Windows Aero, try disabling that first

As long as the resolution stays the same, full-screen and windowed mode should have similar performance.