msokolov commented on PR #14874:
URL: https://github.com/apache/lucene/pull/14874#issuecomment-3054283533

   I tried another test: 
   
   1. knnGraphTest.py with -reindex and -stats (no searching)
   2. knnGraphTest.py with no -reindex and -search
   
   With the idea that if there was some kind of OS paging thing it would affect 
this in the same way as the normal -reindex + -search, but it did not: I saw 
the  latency improvement (around ~13 ms). So this makes me think something 
happens in the JVM that is doing the indexing that predisposes it to have worse 
search performance?  Some kind of hotspot something or other?  Next I want to 
try looking at profiler, but it is a bit tricky since the index + search 
profile is going to be muddied by the indexing part


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