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  1. Sub-task SOLR-15671
    Add SparseBitSet option for faster faceting, lower memory usage, and reduced gc at scael.
  2. Sub-task SOLR-15666
    Heavily reduce faceting ram usage for many cases.
  3. Sub-task SOLR-15563
    Investigate if any minor tweaks can be made to improve the json output paths branch predictability.
  4. Sub-task SOLR-15562
    Offer an MMapDirectoryFactory that writes with DirectIODirectory rather than FSDirectory.
  5. Sub-task SOLR-15561
    Write escaped strings in SolrJSONWriter to a StringBuilder before the writer.
  6. Sub-task SOLR-15560
    Optimize JavaBinCodec encode/decode performance.
  7. Sub-task SOLR-15523
    Add a VirtualExecutor.
  8. Sub-task SOLR-15514
    Add / Compare optional experimental MMapDirectory implementation via custom ByteBuffer lib (eg Agrona, Chronicle Bytes, ...)
  9. Sub-task SOLR-15513
    Review, enhance(?), sql-connect multi-threaded SimpleFaceting impl/config
  10. Sub-task SOLR-15512
    Add support for passing IndexSearcher an executor for multi-threaded multi-segment and possible future multi-threaded per segment search.
  11. Sub-task SOLR-15511
    Add FastThreadLocal type design enhancement and some buffer / object reuse for reduced gc at scale.
  12. Sub-task SOLR-15510
    Add off heap BitSet data structure option and ByteBuffer caching for reduced GC at scale.
  13. Sub-task SOLR-15477
    Logging Performance
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