git-annex/doc/bugs/significant_performance_regression_impacting_datal.mdwn

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### Please describe the problem.
With recent RFing of scanning for unlocked/annexed files (I guess), a sweep of datalad tests on OSX started to take about 3h 30min instead of prior 1h 46min. So pretty much twice. Besides possibly affecting user experience, I am afraid that would cause too much ripples though our CI setup which might not run out of time
Logs etc are at https://github.com/datalad/git-annex/actions/workflows/build-macos.yaml
The first red is ok, just a fluke but then they all fail due to change in output log string (for which there is a fix but somehow behavior on osx seems different, yet to check).
### What version of git-annex are you using? On what operating system?
Currently 8.20210428+git282-gd39dfed2a and first got slow with
8.20210428+git228-g13a6bfff4 and was ok with 8.20210428+git202-g9a5981a15
2021-06-14 15:44:55 +00:00
[[!meta title="performance edge case when adding large numbers of identical files"]]