High CPU usage with desktop widgets

Hi all,
I am experiencing high CPU usage when adding desktop widgets which include a frequently updating graph (like the cpu load monitor, network monitor, memory usage monitor).
Also I see a lot of flickering in the widgets as soon as there is more than one of these.

Anyone?

TIA
Cris

P.S. I did the last distribution upgrade yesterday

Known problem:
https://bugs.kde.org/show_bug.cgi?id=345696

Cris