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Still, the OmniFocus is slow, and can "burp" the UI multiple times after the sync has occurred.

It is far from optimal, and has been a thorn in its side for 4+ years. It is noticeably worse than The Hit List and Things from a performance standpoint. I notice it every time I use it, and spend more time than I should "fiddling" and checking the # of zip files to ensure reasonable performance. I should not have to fiddle with it to ensure reasonable sync performance.