rmuir commented on issue #15212:
URL: https://github.com/apache/lucene/issues/15212#issuecomment-3382848170

   for me just a few rounds iteration of `@Nightly`'ing the long tail has 
brought like 50% improvement (down from 12 minutes to 8 minutes on my system):
   
   Current state:
   ```
   The slowest tests during this run:
      6.39s TestIndexManyDocuments.test (:lucene:core)
      5.64s TestSearcherTaxonomyManager.testNRT (:lucene:facet)
      5.56s TestTrie.testOneByteTerms (:lucene:core)
      5.48s TestStressIndexing.testStressIndexAndSearching (:lucene:core)
      5.33s TestTrie.testVeryLongTerms (:lucene:core)
      4.62s TestStringsToAutomaton.testRandomUnicodeOnly (:lucene:core)
      4.59s 
TestSimpleTextDocValuesFormat.testSortedNumericsMultipleValuesVsStoredFields 
(:lucene:codecs)
      4.58s TestMultiRangeQueries.testRandomRewrite (:lucene:sandbox)
      4.55s TestGeo3dRpt.testOperationsFromFile (:lucene:spatial-extras)
      4.20s TestPayloadScoreQuery.testSpanContainingQuery (:lucene:queries)
   The slowest suites during this run:
     38.82s TestBasicBackwardsCompatibility (:lucene:backward-codecs)
     31.71s TestSimpleTextDocValuesFormat (:lucene:codecs)
     22.72s TestBoolean2 (:lucene:core)
     19.98s TestLucene90DocValuesFormatMergeInstance (:lucene:core)
     17.94s TestAssertingDocValuesFormat (:lucene:test-framework)
     17.88s TestSimpleTextTermVectorsFormat (:lucene:codecs)
     17.54s TestSimpleExplanationsWithFillerDocs (:lucene:core)
     16.37s TestFixedGapPostingsFormat (:lucene:codecs)
     15.81s TestLucene90DocValuesFormat (:lucene:core)
     14.62s TestIndexUpgradeBackwardsCompatibility (:lucene:backward-codecs)
   
   [Incubating] Problems report is available at: 
file:///home/rmuir/workspace/lucene/build/reports/problems/problems-report.html
   
   BUILD SUCCESSFUL in 8m 13s
   ```
   
   First run where nothing took longer than 10 seconds :) There are many 
thousands of tests, we just can't afford to have them taking even whole seconds 
honestly.


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