[CentOS] ATI Proprietary Drivers LAG

I've installed CentOS 5.5, fixed my problems with my network card driver,
and and I've followed this:
http://wiki.centos.org/AdditionalResources/HardwareList/AtiDriver ,
downladed latest ati driver, restarted, screen resolution is fixed, but
everything lags.

ATI Radeon HD 5470 1GB

this is the output of "lspci -v"

*01:00.0 VGA compatible controller: ATI Technologies Inc Manhattan [Mobility
Radeon HD 5000 Series] (prog-if 00 [VGA controller])
        Subsystem: ASUSTeK Computer Inc. Unknown device 1bf2
        Flags: bus master, fast devsel, latency 0, IRQ 11
        Memory at c0000000 (64-bit, prefetchable) [size=256M]
        Memory at d0020000 (64-bit, non-prefetchable) [size=128K]
        I/O ports at d000 [size=256]
        Expansion ROM at d0000000 [disabled] [size=128K]
        Capabilities: <access denied>
*
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