You’re quite right, I should have said “up to 6 times faster”. I was looking at the figure of 496%, and thinking “that’s almost 5,” but that figure is actually the increase in rate expressed as a percentage of the original. That is,

(627362 - 105189) / 105189 = 4.9641 = 496%
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The problem is, that concept — the increase in rate expressed as a percentage of the original — doesn’t mean much to me. Which may be why I have such a hard time remembering it!

i have a problem to interpret the output of Benchmark in the right way.

Me too! :-)

I know when i use cmpthese, the results are sorted from slow to fast.

Exactly, that’s the main point to keep in mind.