Microsoft recommendation for best performance:

  • When uploading large number of files or high volume, the best performance is accomplished outside normal business hours (night time or weekends).

SharePoint On-Premises Fusion is using “CSOM API” in all cases

File Transport Operation mode: “Standard (CSOM API)”
Fastest method in all cases. Throttling is not an issue.
Columns marked as “Required” and not assigned a value will trigger and error condition

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