On Mon, Jan 12, 2026 at 5:38 AM Dawid Weiss <[email protected]> wrote:
>
>
> There is significant variance between runs on github - I think this view 
> shows it clearly:
>
> https://github.com/apache/lucene/actions/workflows/run-checks-all.yml?query=branch%3Amain
> https://github.com/apache/lucene/actions/workflows/run-checks-all.yml?query=branch%3Abranch_10x
>
> The slowness on 10x may be attributed to some cleanups to tests that have 
> been only applied to main. This is my guess, at least. It would be worth 
> reviewing and
> reapplying those to 10x as well.
>

There were some particular tests that were extremely slow on windows and macos.

But also there were some fairly invasive improvements on build side
related to this problem:
* we switched to more efficient runners on pr/push (ubuntu24.04-arm)
and only triggering the macos at night.
* use default flags (C2 compiler disabled, number of cores detection),
this had a very large impact.

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