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> My own customers have seen 4x different conversion rate, when grouped by page load time

Was that a controlled test?

If just a correlation, then other variables might confound i.e. users from overseas, users with a slow connection, users with a slow computer.

Agree with you though!

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I agree there's certainly some correlation, but we can fix e.g. "slow connections" and "slow computers" by not serving 9MB auto-playing hero videos [edit:] when it's not appropriate for your user demographics.

I'm not in the position to intentionally slow down my customers, so I haven't run a controlled test. Google's test was controlled though.

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