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Wow, I couldn't disagree with this more.

No offense.

Stropping slowly works just fine. Assuming the downward pressure on the blade is equal, one slow stroke puts the same amount of force...

Why do you believe it is important to strop fast during the stroke?

IMHO, going fast is a sure-fire way to get sloppy and ruin your edge. And I'm not aware that speed helps in any way.