westonpace commented on issue #36783:
URL: https://github.com/apache/arrow/issues/36783#issuecomment-1650329566

   The latest plot is somewhat fascinating.  It seems performance has partially 
recovered, but not all at once.  It has recovered in a very smooth (practically 
linear) curve.  While this is aesthetically pleasing it is baffling as to what 
might be the cause.
   
   
![image](https://github.com/apache/arrow/assets/1696093/a6b6a417-461b-4d03-abc9-e2de36c8a55a)
   
   There are also other benchmarks (not tpc-h) which are exhibiting regressions 
on this machine that haven't been detected yet such as 
https://conbench.ursa.dev/benchmark-results/064c00b67d8c7b298000439798b81c6a/ 
or 
https://conbench.ursa.dev/benchmark-results/064c00bbf4567f3380006cb89abd317c/ 
(this one is only testing integer parsing and not very complex)
   
   Given all these touch points I do not believe this to be a change in the 
Arrow code itself.  It could perhaps be tied to brew, mac CI, or just the 
hardware.


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