Xorg log shows:
(EE) intel(0): Cannot support DRI with frame buffer width > 2048.

which is caused by this setting in your xorg.conf
Virtual 2560 1024

If you want to use compiz, you will need to reduce the virtual display
width to a maximum of 2048.

-- 
Poor display performance w/Intel 945GM, cannot enable desktop effects
https://bugs.launchpad.net/bugs/360713
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