Ok now right click on ioftpd and choose properties. THen you see another window with all the stuff io is using. Look specially at performance, performace graph but also (very important) at the threads. Likely there is one thread eating your cpu. If so try and kill the thread and see what happens. Be aware tho it might crash io so it is just to find out if it is the case. You may be able to find out why so much cpu is taking.
Also you can use filemon to see if io is constantly busy reading writing files (kick everyone out first of course).
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