I think I found it: an extra set of files copied from one of my old Windows machines prior to converting to Tumblweed. Around 700K files amounting to 1.6TB that I had staged there for copying to external storage and then never cleaned up. With that gone the scrub performance drop kicks in at around 85-90% completion. I can attribute that to insufficient RAM and L2ARC for the entire storage pool but I can increase the L2ARC size to accommodate.
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