That makes a lot of sense to me, and that's the situation I'm trying
to get to. But right now all I have is the original (unsorted) raw
data. So I need to load it into memory and sort it.
You don't necessarily need to sort all of it at once. You just need to
find the first few items, to display in your table view. If the user
scrolls past those, you need to find more. You can do this by
streaming the data from a file, keeping only the number of items you
need in memory at once. This sort of task is typically called
"external sorting", and Knuth and most other algorithm texts talk
about it.
But that said, the sort you're doing shouldn't freeze or crash, not
unless you eat up your processes' entire address space or use up so
much VM that the system starts to thrash. You'll have to provide more
details of what's happening.
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