emecii commented on PR #11051:
URL: https://github.com/apache/arrow-rs/pull/11051#issuecomment-5624177901

   Addressed in df459692. I added a deterministic Criterion benchmark that 
reports encoded bytes plus encode/decode timings. In one 20-sample local run 
over 16,384 INT32 values, moving from 128/4 to 256/4 reduced stable-width 
output from 66,699 to 66,123 bytes, encode time from 66.76 to 62.71 us, and 
decode time from 9.71 to 9.16 us. For locally varying widths, output grew from 
35,131 to 42,161 bytes while decode time fell from 10.59 to 9.22 us. The public 
docs and PR body now use these results to recommend retaining defaults unless 
representative data shows a worthwhile compression/throughput trade-off.


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