First of all, thank you for this article but with due respect, there are several flaws in it and the result leaves quite a large room for improvements, suggest you follow...

Quick question, which version of SQL Server are you on?
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Here is a simple test harness and the result set from my old i5 laptop
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USE TEEST;
GO
SET NOCOUNT ON;

DECLARE @SAMPLE_SIZE  INT   = 2000000;