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ci: probe why the win-arm64 leg is slow (do not merge) - #5798

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This draft is only here to measure the win-arm64 runner. Please don't review or merge it. I'll close it once the runs finish.

On #5793 the win-arm64 leg was 2 to 5 times slower than win-x64 on every step that writes a lot of files, with both using #5782's layout:

Step win-x64 win-arm64
checkout 33 s 65 s
setup-android 16 s 64 s
setup-dotnet 60 s 140 s
workloads 58 s 103 s
restore 44 s 235 s
build 171 s 266 s

The x64 runners keep the workspace on D:, but the arm64 runner only has C:, and its image readme doesn't say how Defender is set up. So the probe runs the leg's steps four ways, twice each:

  • baseline, the leg as on main,
  • realtime-off, with Defender's real-time scanning turned off,
  • dev-drive-caches, with .NET, the NuGet packages and TEMP on a Dev Drive,
  • dev-drive-all, with the workspace on that Dev Drive too.

Each job also logs the CPU, the disks and Defender's status.

#skip-changelog

A throwaway workflow, not for merging. It runs the win-arm64 leg's
steps with Defender's real-time scanning off and with Dev Drives, next
to an unchanged baseline.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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codecov Bot commented Oct 24, 2026 •

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.13%. Comparing base (b41b96c) to head (80bfd4e).

Additional details and impacted files
@@           Coverage Diff           @@
##             main    #5798   +/-   ##
=======================================
  Coverage   76.13%   76.13%           
=======================================
  Files         528      528           
  Lines       19579    19579           
  Branches     3829     3829           
=======================================
  Hits        14906    14906           
  Misses       3791     3791           
  Partials      882      882           

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