I seem to have this problem as well. After a few days, my installation of 
Kubuntu 9.10 become extremely slow, the kickoff launcher is missing all entries 
and compositing is disabled due to slow response. I just checked system monitor 
and found that system memory is fully utilized and the greatest offender is 
'plasma-desktop' (currently using 2,041MiB). The second highest useage is 
'nepomukservicestub' (using 286 MiB). This is making Kubuntu practically 
unusable for me. I have a dual-core AMD Athlon 64 4200+ CPU with 4GB of RAM 
installed.
  kdebase-workspace- 4:4.3.4-0ubuntu1~karmic1

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Epic plasma memory leak (0.1 mb / sec)
https://bugs.launchpad.net/bugs/343944
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