risdenk commented on PR #1545:
URL: https://github.com/apache/solr/pull/1545#issuecomment-1497838599

   So found the issue I think (I don't know how it manifests itself more during 
the upgrade, but this is a big improvement):
   
   AwsChunkedDecodingInputStream 
(https://github.com/adobe/S3Mock/blame/main/server/src/main/java/com/adobe/testing/s3mock/util/AwsChunkedDecodingInputStream.java)
 is used during putObject and only implements read() which is a single byte 
read at a time. 
   
   A quick fix is to wrap the input source in new BufferedInputStream which 
then speeds everything up. It took the test on my laptop from 11s to <1s easily.


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