Manual sweep of !66830 from main to 23.0: Fix for slow finalize in ATLFAST3MT jobs with large numbers of threads

John Derek Chapmanrequested to merge
cherry-pick-d58806ee into 23.0

Fix for slow finalize in ATLFAST3MT jobs with large numbers of threads

See merge request !66830 (merged)

(cherry picked from commit d58806ee)

2b8ca473 Fix for slow finalize in ATLFAST3MT jobs with large numbers of threads

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