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A "1% improvement in conversion rate" is a big claim to make for a claim that seems so small.

That is, if you wanted to prove that "X is better than Y by 1%" you would need a sample approaching 10,000 attempted conversions to have a hope of having a good enough sample.

And I assume that’s why the author has put 4 references to that claim

There is a slew of case studies that support this line of thinking. Page speed impacts user retention and conversions.

See: https://developers.google.com/web/fundamentals/performance/w...

According to the page, it was Amazon that made the original claim, so they would have the necessary sample size.

But there's no guarantee that it will apply for all pages.

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