msokolov commented on issue #16618:
URL: https://github.com/apache/lucene/issues/16618#issuecomment-5512617553

   The speedup/slowdown is pretty remarkable, but I wonder if you could share 
total CPU comparing the "full rebuild" with the graph reuse optimized merge? I 
suspect we are saving on CPU usage, but losing on wall clock time due to the 
reduced concurrency.  That wouldn't be the worst sin, and I think we'd rather 
have the fix for the recall drop even at the expense of some merging latency, 
and while we should fix this, I don't know if we can consider a bug so much as 
an opportunity for further optimization.


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