rmuir commented on issue #14546:
URL: https://github.com/apache/lucene/issues/14546#issuecomment-2823753882

   This test is old, i think. The background IIRC is that for some Directory 
impls (e.g. NIOFSDirectory or others that use "buffered input"), `clone()` may 
cause at minimum a 1KB read/buffer refill. For MMapDirectory the clone() may be 
cheaper and so excessive cloning may go unnoticed, yet cause a performance 
issue for some.


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