After merging your PR, Conbench analyzed the 3 benchmarking runs that have been run so far on merge-commit f268c43.

Benchmarks with performance regressions

There were 0 possible performance regressions, according to the lookback z-score method.

All benchmark runs analyzed:

• Commit Run on arm64-t4g-2xlarge-linux at 2025-10-14 07:01:51Z
• Commit Run on amd64-m5-4xlarge-linux at 2025-10-14 04:34:48Z
• Commit Run on test-mac-arm at 2025-10-14 06:31:47Z

Unstable benchmarks with performance regressions

The following benchmark results indicate a possible performance regression, but are known to sometimes produce false positives when applying the lookback z-score analysis.

• Commit Run on arm64-t4g-2xlarge-linux at 2025-10-14 07:01:51Z
  • ThreadPoolSpawn (C++) with params=threads:2/task_cost:100000/real_time, source=cpp-micro, suite=arrow-thread-pool-benchmark