gf2121 commented on PR #12661:
URL: https://github.com/apache/lucene/pull/12661#issuecomment-1767756956

   > So this looks like a hard search/space trade-off: we either get fast reads 
or good compression but we can't get both?
   
   IMO theoretically yes. We ignored some potential optimization for `#add` and 
`#read` in past so we're suffering from performance regressions that are beyond 
reasonable. When we take care of this, things could be better.
   
   This PR optimizes `#add` and brings `PKLookup` back to its original speed 
(locally). I think this it is ready for review. I'll raise another PR to try to 
optimize `#read`, probably reduce the regression for `Fuzzy` queries.
   
   


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