Jeff King <peff@peff.net> writes:

quoted text
> So untracked_files is definitely the worst, but I was surprised that
> the index to HEAD diff takes so long.

There is an obvious optimization you can do to "diff-index --cached" using
cache-tree.  If your index is really clean, computing the tree object the
index would represent (without writing the tree object out) and comparing
it against HEAD^{tree} may be a tad faster.
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