Installing Ubuntu's supported ATI driver fixes the problem.
Can verify that with the supported ATI driver installed,
xserver-xorg-d 6.5.7.3-0ubunt X.Org X server -- ATI display driver,
that matrixview and other rss-glx screensavers run much faster, not
quite as fast as fglrx with xscreensaver, but perfectly acceptable.
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rss-glx really slow (only 1-2fps) since recent fglrx driver update
https://launchpad.net/bugs/51576
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