Hi all, Bron has analysed the problem of the low start and it seams due to the locking on the mailbox.db for each mailbox. Something like //for mailbox in $mailbox_list // lock mailbox // do something // unlock The lock/unlock seams to be a bottleneck for the GFS. Using the flat configuration for the mailbox.db the slow start disapepars. May I use a flat database for 4300+ mailbox? Do you think I could have other performance problems in delivery/accessing the mailbox? Regards Maurizio ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html