Very interesting, your code works lightning fast even with my original template (with merged cells), except it doesn't copy rows height, a minor issue, which can be fixed.
It does however changes data in each copy by increasing all found numbers, which also easily fixed by changing autofill line to
So far all evidences point out something wrong with my Office/computer...just tested with different version on virtual computer it worked fine there, installed exactly the same OS and Office on this computer and..same issue..
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