On: Google AMP – A 70% drop in our conversion rate

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They absolutely do take load speed into account when ranking pages.

https://webmasters.googleblog.com/2018/01/using-page-speed-i...

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Yes, they do. My apologies if I seemed to imply that they don't.

They don't weight it high it enough. The fact that it took until 2018 until they did that for mobile is telling enough.