Bulk Delete of completed System Jobs very slow

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Our On-Premise installation ( has a AsyncOperationsBase table contains about 950k records. And that’s after running the query in this KB https://support.microsoft.com/en-us/help/968520/performance-is-slow-if-the-asyncoperationbase-table-becomes-too-large.

So I ran a bulk delete to clear out approximately 300k records (checked with a XrmToolbox plugin).

The job went to the locked/in-progress state immediately and the CPU on the SQL box sat at 90%+ at 3pm yesterday.

I checked progress this morning at 7am and the CPU on the SQL box was still 90%+ but the job had deleted just 10k records.

2 hours later and the job reports 50k records deleted, all the while with the CPU pegged at > 90%.

The SQL box has 12 cores and ample RAM (not 100% used). Our monitoring tools show that Disk IO is at virtually 0%.

Is this typical performance? Is there a way to speed it up?

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