After merging your PR, Conbench analyzed the 2 benchmarking runs that have been run so far on merge-commit 353a0a2.

Benchmarks with performance regressions

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

All benchmark runs analyzed:

• Commit Run on test-mac-arm at 2025-10-08 03:52:20Z
• Commit Run on arm64-t4g-2xlarge-linux at 2025-10-08 03:27:42Z

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 2025-10-08 03:27:42Z
  • ReferenceCompression (C++) with params=Compression::LZ4_FRAME, source=cpp-micro, suite=arrow-compression-benchmark
  • ReferenceCompression (C++) with params=Compression::LZ4, source=cpp-micro, suite=arrow-compression-benchmark
  • ReferenceStreamingCompression (C++) with params=Compression::LZ4_FRAME, source=cpp-micro, suite=arrow-compression-benchmark
  • ReferenceDecompression (C++) with params=Compression::LZ4_FRAME, source=cpp-micro, suite=arrow-compression-benchmark