Abacn commented on PR #26893:
URL: https://github.com/apache/beam/pull/26893#issuecomment-1563554627

   It appears that read from SyntheticSource is still slower than read from 
ReShuffle service. For kafka xlang test:
   
   read from SyntheticSource (lcg) write_runtime Value: 403 s that is 6.7 min
   read from ReShuffle service, write_runtime is now < 5 min
   
   Unrelated but there is an improvement on May 13 where the run time for both 
write and read reduced significantly. Before that write time is 6.5 min
   
   <img width="716" alt="image" 
src="https://github.com/apache/beam/assets/8010435/27f24057-d48e-4891-8fdf-a2bcd2c2fdcf";>
   


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