p.s.

But when these are faulted in, according to Instruments, Core Data
allocates a GeneralBlock-528384 per record!  Even if you naively
preallocated a good chunk of memory for the strings, I can't imagine
using more than 1-2KB per record, so  516KB is totally ridiculous.

When I run Instruments against iCal (which uses Core Data), the only blocks I see of sizes on this order of magnitude are from the Security framework. When I run it against Address Book, no general blocks are greater than 10% that size, and those are from ColorSync.

- Ben

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