iemejia opened a new pull request #14755:
URL: https://github.com/apache/beam/pull/14755


   We have had many reports of performance degradation since the switch to the 
SDF by default read translation, and our own tests found between 20-25% 
performance degradation that we cannot justify. This PR is basically 'a revert' 
of #13021
   
   It introduces the new `use_sdf_read` so we can still have a path to test the 
performance of the SDF path so we can be able to judge when to make it the 
default again.
   
   R: @kennknowles 
   CC: @boyuanzz @lukecwik @ibzib (for awareness)


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