> The culprit, according to some callgrind investigation, is
> lookup_commit_reference_gently() [for the unannotated case] or
> deref_tag() [annotated case] calling parse_object().
Using the scenario you described earlier, I think it ends-up spending
most of its time in check_sha1_signature (both deref_tag and
lookup_commit_reference_gently() go there) with 20% inflating, 80% in
SHA1_Update(). Not much we can do about that, can we ?
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