Fan almost always on using Ati open source drivers and I resolved it but now the system is laggy

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http://askubuntu.com – My notebook Toshiba has an Ati Mobility Radeon HD5650. I forced to use open source drivers because in my case they work much better than proprietary drivers. With these latter I have always a lot of problems that's why I prefer to use open source drivers. The only problem I had with them is that the fan was almost always on so now I resolved following this link: http://javacolors.blogspot.it/2011/10/ubuntu-1110-ati-radeon-deal.html And now fan isn't always on anymore so I resolved this problem but now I have another little problem: the animations and effects are laggy and not smoothy like befo (HowTos)