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https://issues.apache.org/jira/browse/ARROW-17872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17610524#comment-17610524
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Jacob Wujciak-Jens commented on ARROW-17872:
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I have set up a test job with debug output to see what exactly is taking so
long:
https://github.com/assignUser/test-repo-a/actions/runs/3142905685/jobs/5107502078#step:4:392
If you turn on timestamps you can see that what takes the time is extracting
the archives (e.g. llvm ~1.5G) not downloading them, so caching the {{hombrew
--cache}} directory would not save significant time. As the cache is also tar'd
extracting the cache might be the new bottle neck....
> [CI] Cache dependencies on macOS builds
> ---------------------------------------
>
> Key: ARROW-17872
> URL: https://issues.apache.org/jira/browse/ARROW-17872
> Project: Apache Arrow
> Issue Type: Wish
> Components: C++, Continuous Integration, GLib, Python
> Reporter: Antoine Pitrou
> Priority: Major
>
> Our macOS CI builds on Github Actions usually take at least 10 minutes
> installing dependencies from Homebrew (because of compiling from source?). It
> would be nice to cache those, especially as they probably don't change often.
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