[ubuntu] Desktop Works slower after disabling Visual effects

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http://ubuntuforums.org – Hey guys!!! I'm running Ubuntu 10.04 LTS on an old hardware. Everything is working perfectly but when i'm disabling visual effects, my desktop works slower. I mean when i want to see my desktop the desktop icons pop up slower and when im making a drag box with mouse it begins to freeze! Turning visual effects to normal solves this problem, but i don't want these effects to be on. Can anybody help me please, thanks! (Hardware)