In the hangout from yesterday with Google’s John Mueller he said something I never knew before, that pages that load really slowly may be considered NOT mobile friendly.

He said at the 21:39 mark into the video:

Here is the video embed:

Why does this somewhat surprise me? Google has told us that for page speed, they only look at desktop page speed and thus, why in the world would they use that speed for mobile-friendlyness? At least look at the mobile page speed if you are going to use it against the site being mobile-friendly?

What is interesting is that John Mueller said my page speed for the not mobile friendly label I got yesterday was likely the cause:

But the page speed is over 50 for me and others. Plus we have native iOS and Android apps and we are AMP enabled. So shouldn’t the mobile friendly work off AMP, since Google serves that page to mobile users?

So the key here is that really slow pages may trigger a page to be not mobile friendly by Google.

Forum discussion at Google+.