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git-annex uses FilePath (String) extensively. That's a slow data type.
Converting to ByteString, and RawFilePath, should speed it up
significantly, according to [[/profiling]].
I've made a test branch, `bs`, to see what kind of performance improvement
to expect.
Benchmarking `git-annex find`, speedups range from 28-66%. The files fly by
much more snappily. Other commands likely also speed up, but do more work
than find so the improvement is not as large.
The `bs` branch is in a mergeable state now. [[done]]
Stuff not entirely finished:
* Profile various commands and look for hot spots involving conversion
between RawFilePath and FilePath.
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