I imagine you have compiz running and a resolution above 1024x768 and have an ATI graphic card using the default /ati/radeon driver that came with the install.
You can workaround the problem by either turning of compiz (Alt+F2 and type metacity --replace in the box) or by running at a lower resolution, or by using 16 bit colour, which is what I did.
The easiest is obviously to not use compiz, but I still found that graphics were slow on my ATI 9200SE card unless I used the 16 bit colour option.
here's the config part of /etc/X11/xorg.conf that I used in my machine. Try an edit to your hardware resolution etc etc and see if it works for you.
Code:
Section "Device"
Identifier "Configured Video Device"
Driver "ati"
Option "AccelMethod" "UXA"
EndSection
Section "Monitor"
Identifier "Configured Monitor"
HorizSync 30-80
VertRefresh 50-75
EndSection
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
DefaultDepth 16
SubSection "Display"
Modes "1280x1024" "1280x960" "1152x864" "1024x768" "832x624" "800x600" "720x400" "640x480"
EndSubSection
EndSection
Things are better in 10.04 and even better in 10.10, but there are possible other problems there depending on hardware. For me, 10.04 is the best yet, once I have the xorg.conf sorted properly.
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