I noticed a constant stream of alert notifications of high CPU for more than 5 minutes. I did not notice any particular performance issues with the forum, but then I might not even if there were some - others might notice issues without me noticing anything. What I noticed was many monitor alerts of abnormally high CPU usage.
Since these alerts required high CPU usage for at least five minutes, I would presume that with the setting as it was it was spending more than five minutes out of every 15 at high CPU which seems dangerously close to continuous high CPU usage and perhaps ending up with the system starting the next batch before finishing the previous batch depending on how it is implemented, which could then lead to a cascade performance failure. Unless the 15 minute in the preference does not start counting until the end of the batch…