uschindler commented on PR #15116:
URL: https://github.com/apache/lucene/pull/15116#issuecomment-3237043170

   > In the [8/25 
run](https://benchmarks.mikemccandless.com/2025.08.25.18.04.16.html), Pre and 
PostFilteredVectorSearch also saw nice gains!
   > 
   > 4.8606994665086% and 3.21647379169503%, respectively ;)
   
   Yeah, I saw this too (used a calculator entering the numbers in first and 
3rd column by hand. :-)
   
   So basically you have an improvement for the GroupVInt encoding when using 
MMapDir on prefix queries with many seldom terms and for vectors.
   
   The backport is ongoing, see https://github.com/apache/lucene/pull/15138


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