What happened?

This workflow has been significantly slowing down since 2.67.0
https://github.com/apache/beam/actions/workflows/python_tests.yml?query=branch%3Amaster+is%3Asuccess

17 min -> 34 min (Use Prism as default)

• https://github.com/apache/beam/actions/runs/16780692161
• https://github.com/apache/beam/actions/runs/16781596010
  • Tests still took around 17+ mins to run on mac, while the time on windows is doubled (33+ min).

34 min - 1h (Make Test Deterministic)

• https://github.com/apache/beam/actions/runs/17051634406/
  • Tests on both mac and windows have double runtime.
    • mac: 30 mins
    • window: 1 h

1h -> 2h (Install Go)

• https://github.com/apache/beam/actions/runs/17881130471/job/50848919392
  • Tests on mac now take 4 times more than before.
    • mac: 2h 30 mins
    • window: 1h

Issue Priority

Priority: 2 (default / most bugs should be filed as P2)

Issue Components

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