Go and get a copy of TASKINFO (see below). It shows all your running tasks and the %CPU use of each and resources and other stuff you really don't need to worry about.
I have had exactly your problem recently and it was a bad linkup on the ActiveSync to my PDA. The PDA was removed from its' cradle but the ActiveSync was still hogging 96% of CPU trying to do whatever. Needless to say things were not fast ....
Larsens TaskInfo
Now I know this will help ..... for a change - lol
MG