wesm commented on PR #13661:
URL: https://github.com/apache/arrow/pull/13661#issuecomment-1192007059

   In 
https://conbench.ursa.dev/compare/runs/e938638743e84794ad829524fae04fbd...20727b1b390e4b30be10f49db7f06f3f/
 it seems that there are several hundred microbenchmarks with > 10% performance 
regressions but also over 100 microbenchmarks with > 10% performance 
improvement. I'd say it's a coin toss whether to move to -O2 (with 
-ftree-vectorize) versus -O3.


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