Please try these 3 things independently:
1) Create an /etc/X11/xorg.conf with this contents:
Section "Device"
Identifier "myradeon"
Option "SwapbuffersWait" "False"
EndSection
2) Create a .drirc file with this contents:
<driconf>
<device screen="0" driver="dri2">
<application name="Default">
<option name="vblank_mode" value="0" />
</application>
</device>
</driconf>
3) This would work in Ubuntu 10.10 but I think not in 11.04 (gallium needs KMS):
Boot with adding this to the kernel options in the grub menu: radeon.modeset=0
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https://bugs.launchpad.net/bugs/736760
Title:
[RV515] low OpenGL frame rates
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