Nothing like posting a question in a public forum to get you to find the
(obvious) answer yourself. In xorg.conf, I replaced
Option "AccelMethod" "exa"
with
Option "AccelMethod" "xaa"
and now everything is speedy again. I'm not clear on what I'm losing
by doing this, but I don't do anything that pushes the graphics too far.
Nothing like posting a question in a public forum to get you to find the
(obvious) answer yourself. In xorg.conf, I replaced
Option "AccelMethod" "exa"
with
Option "AccelMethod" "xaa"
and now everything is speedy again. I'm not clear on what I'm losing
by doing this, but I don't do anything that pushes the graphics too far.