Github user afs commented on the issue:
https://github.com/apache/jena/pull/297
Jena 3.5.0 went out with `<threadCount>2</threadCount>` which is per-core
(hyperthreading seems to count as 2 for a total of 4 per CPU-chip).
`threadCount=1` made a big difference and a setting of 2 more so. Changing 2 to
4 made little difference. [Write-up on the JIRA
ticket](https://issues.apache.org/jira/browse/JENA-1407?focusedCommentId=16222769#comment-16222769).
@rvesse With that, are you happy to close the JIRA and this PR? Do you
want to bump to 4 anyway?
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