our Groupwise server runs on SLES10 SP4, has about 2500 accounts in 7 postoffices, one gwia, one mta and webaccess.

When IMAP is activated on the gwia, the cpu load goes to 99% after a couple of hours, making the server unusable. When I turn IMAP off the cpu load is stable under 1%.

We have already limited the number of items per folder to 1000.

Where do I look? What do I do? I'm at my wits end!!!