Ok, I did a quick version that didn't replace anything at all, and it
doesn't look like there is room for that helping much. Yes, I can speed
things up, but it didn't get much faster than just raising the delta cache
to 1024 entries.
Admittedly my quick hack might have been fundamentally flawed, but it was
such an ugly thing that I'm not even going to post it.
And the added memory footprint makes it unacceptable, so it's going to be
limited by the cache size anyway, and not get a lot of hits in git
rev-list, methinks.
Linus
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