I'd say usually this is the case.
But it did happen to me last week with Quadro FX 1000 in a P4 3ghz.
Repaint and Rebuild did nothing.
Just shut SWX down and restart -- quite often this tactic works on
intermittent issues. (or at least for me it was intermittent)
According to the SW website, the driver your using has "significant
stability and repaint problems"
6.13.01.6166 should solve some of the problems, You'll probably still have
the multi-window slowdown though.