Thread: Why So Slow??
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If you want to see if compacting the database is enough to clean up your slow sync, you don't have to wait an hour if you have all of your devices handy.

Sync your Mac.
Sync all of the other clients.
Back on the Mac, bring up OmniFocus preferences, sync pane, client display. Select each of the clients and click the unregister button.
Sync the Mac again.
Sync your other clients. When you sync the other clients, you may be asked if you want to keep the device or the sync database. Choose the sync database.