I am moving user mailboxes to a new PO (on a new server). I notice that on the destination PO, in the wpcsout/ofs/6 queue - there are about 170k messages waiting to be processed, and every 1-2 seconds they decrease only by 1-2 , and every now-and-then they increase by another 100-200. In the same time, the gwpoa is on near-100% CPU.
I've checked disk performance on the destination machine - 226MB/s writes, 549MB/s reads - which looks OK.
The destination machine is a SLES12 VMware VM, with 16GB RAM AllReserved, and 4CPUs (gwpoa utilizes one of them on near-100%).
I tried to increase the MessageWorkerThreads - now they are 18, the C/S Handler Threads - now they are 80, and the MaxThreadUsageForPrimingAndMoves is now 60%.
Any ideas how to speed it up? I don't see any errors in the verbose log, users are not complaining about performance, but I am moving a few accounts since more than a week now...