epotyom commented on PR #13657:
URL: https://github.com/apache/lucene/pull/13657#issuecomment-2296904888

   Just for tracking, repeating this comment 
https://github.com/apache/lucene/pull/13656#issuecomment-2296813725 here:
   
   > The biggest difference in the profiler seems to be that we spend more time 
in org.apache.lucene.search.similarities.BM25Similarity$BM25Scorer.score(float, 
long) now?
   
   I've tried changing `SIMILARITY_DEFAULT` to `ClassicSimilarity` in 
`src/python/constants.py` . There is still regression seen in the caller method 
`org.apache.lucene.search.LeafSimScorer.score(int, float)`, but not so much in 
the `Similarity` itself:
   
   
![flamegraph_two_tasks_only_ClassicSimilarity](https://github.com/user-attachments/assets/e14529ed-f199-42b3-9b83-80321f15053e)
   
   JFRs: 
   
[ClassicSimilarity.zip](https://github.com/user-attachments/files/16662602/ClassicSimilarity.zip)
   
   


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