Angry Birds PC lags in windowed mode

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http://ubuntuforums.org – I got Angry Birds working in Wine, both Space and regular. But, I don't like playing games in fullscreen mode. So, changing from fullscreen to windowed mode, makes the game super laggy. I've also tried changing the resolution in the config file. I am running, Ubuntu 12.04 64-bit with GNOME shell. (Hardware)