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I had read awhile back that Unison does not preserve HFS+'s extended attributes. Has that changed in a recent version?

Update: AeroFS now preserves modification times across devices :)

I used Unison + cron for years, but recently I had to replace a machine, and discovered to my horror that my synced directory has grown beyond the size that Unison is capable of doing an initial synchronization of, EVEN if I precopy all the data. So AeroFS looks like it might be a killer app for me.

Is there any way to speed Unison up on large datasets? It runs unusably slow even to scan changes of something like my mp3 directory.