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I've spent all week working on performance. It started when Lukey
found a way to use git cat-file --buffer to make --all faster.
Once implemented, that turned out to be a 2x to 16x speedup in seek time.
I felt that same approach could probably also speed up other parts of
git-annex that use git cat-file, so spent another 4 days finding ways to do
that. Some of the ideas are not implemented yet, but I landed a 2x speedup
today, to all git-annex commands that seek annexed files to work on.
Oh and also there used to be a git-annex branch read cache, but it got
removed many years ago, and I forgot it had been removed. Which does not
lead to writing the fastest code. Bringing the cache back makes some things
another 20% faster.
----
This work was sponsored by Mark Reidenbach, Jake Vosloo, and Graham Spencer
[on Patreon](https://patreon.com/joeyh).
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