I installed Postbox 3.0.6 and then added SpamSieve per instructions on c-command page. I should mention SpamSieve runs flawlessly and lightning fast with Apple Mail.
With Postbox, I have it configured to move spam to Junk On My Mac. It can take 30-60 seconds to process one incoming message and if I have a number of them, it pretty much hangs Postbox. By the way, with SpamSieve disabled, Postbox functions fine.
Any hints on how to make the Postbox / SpamSieve integration fast?