i have same issue on karmic.....

top shows these . . .
 2173 aftertaf  22   2  359m  59m  27m R 46.9  3.0   3:01.18 plasma-desktop
 1107 root      20   0  123m  39m 8016 R 21.5  2.0   1:56.79 Xorg
 2167 aftertaf  20   0  286m  43m  20m R  8.9  2.2   0:41.93 kwin

67% of CPU, with nothing running  . . . .

I have no *exotic* plasmoid-widget-applets.

Same thing, changing desktop settings, playing around with the system
tray notification popup settings etc, brings it down to reasonable
levels.... (until it triggers again . . . . for reasons unknown)

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 2217 aftertaf  20   0  166m  37m  21m S  5.3  1.9   0:15.94 yakuake
 1107 root      20   0  137m  44m 8384 S  5.0  2.2   2:55.35 Xorg
 2167 aftertaf  20   0  288m  45m  20m S  1.3  2.2   1:01.44 kwin
 2173 aftertaf  22   2  365m  67m  29m S  0.7  3.4   4:44.02 plasma-desktop

-- 
kdeinit4: plasma-desktop takes 60-90% of CPU
https://bugs.launchpad.net/bugs/419054
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