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45.23 NVidia drivers bad for windowed Direct Draw?

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I just ran some old Direct Draw code in windowed mode and found my frame rate had dropped from a steady 85 (my monitor vsync rate) to about 20fps. Running it full screen was fine. I tested some other old Direct Draw programs and they all suffered the same problem. I have a GeForce 4600ti and the only change I''ve made recently is to upgrade the NVidia drivers to the latest version (45.23) Can anyone else confirm this is happening to them too? If so, people still developing Direct Draw apps intended for release should bear this in mind.

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