Re: Timeouts on branch_10x checks

I just came across these in the elasticsearch CI as well.  I’ve opened https://github.com/apache/lucene/pull/15563 to backport some of Robert’s changes.

> On 12 Jan 2026, at 14:24, Robert Muir <[email protected]> wrote:
> 
> 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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