I followed some guidelines that I found here: http://ubuntu-
virginia.ubuntuforums.org/showthread.php?t=1141060

Which led me to looking at my "/etc/X11/xorg.conf" file.  It was mostly
empty, so I added in the following lines, as indicated in the link
above.  And now everything is running much better.  I'm sorry if this
was already covered somewhere in this thread.

Section "Device"
Identifier      "Configured Video Device"
Driver "ati"
Option "DynamicClocks" "on"
Option "mtrr" "on"
Option "DesktopSetup" "Single"
Option "ScreenOverlap" "0"
Option "VideoOverlay" "on"
Option "OpenGLOverlay" "off"
Option "Stereo" "off"
Option "StereoSyncEnable" "1"
Option "FSAAEnable" "no"
Option "FSAAScale" "1"
Option "FSAADisableGamma" "no"
Option "FSAACustomizeMSPos" "no"
Option "UseFastTLS" "0"
Option "BlockSignalsOnLock" "on"
Option "XAANoOffscreenPixmaps"
Option "AccelMethod" "XAA"
EndSection

-- 
[ubuntu 9.04] slow unminimizing with ati card and desktop effects enabled
https://bugs.launchpad.net/bugs/351186
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