[nonplusplus]

Thanks Brian, I've successfully got it down to 1 zip file. I forced a compaction, as per your strategy above, but I also had to reinstall OmniFocus on the iPhone, and start a "New Database" on first run, in order to get the "Local copy"/"Server copy" dialog. Well, I chose server copy, got my shared settings, and sync'ed. (I should note that it booted me to the home screen once it had done sync'ing.) Startup time is now much faster: 1-2 seconds.

- I just tried creating one test action on iPhone and sync'ed: 4.5 minutes.

- Again, tried creating a sample action and sync'ed: 2.25 minutes.

- Just pressed sync again without creating or modifying anything: 1.25 minutes.

I'm now up to 5 zip files. We'll see if it goes down again once I sync the Mac version some more times.