Plasma-desktop becoming very slow

[Stephan Diestelhorst <stephan.diestelhorst@xxxxxxxxx>]

Hi,
  after leaving my system running for a while with virtuoso-t eating
some CPU, virtuoso-t eventually finishes and everything is fine.

However, although the CPU load stays very low, plasma-desktop is
*very* slow.  Clicking on the virtual desktops in the bar will switch
the desktop after sevaral minutes(!), and the list of windows is not
really updated.  Also, Alt + F2 takes approx. 45 secs to open the
krunner dialog.

Switching desktops with Ctrl + F1 is fast and the respective
applications work fine, too.

This is on Kubuntu 11.10 with KDE 4.8.2.

Any ideas how to fix this?

Stephan

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