Akshay-A-Kulkarni commented on issue #36765:
URL: https://github.com/apache/arrow/issues/36765#issuecomment-1642553822

   > .....
   > I'm pretty sure that the `kLeastMemory` options use very low memory (even 
when scanning large files). I wasn't convinced that `kMaxSpeed` was much faster 
(but I only tested local disks and not S3).
   > 
   > I am very surprised to see a 10x difference due to pre-buffering. I don't 
think any of our experiments (S3 or not) ever showed a difference that was that 
drastic.
   
   @westonpace I was surprised as well. but I've received similar speedup 
results from a colleague facing the same issue. On that note, are you able to 
replicate the issue with the snippet ? 


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