Are they wrong? (got a citation for it that I can point curious clients at?)

endymi0n · on Oct 21, 2017

Technically not, but for SEO ranking, it's one of a hundred factors that even if you max it out, it's a rather small one: https://searchengineland.com/seotable

Talk about diminishing returns here.

Source: We've got an Angular 1 SPA as a website that despite maxing out in the 70s for page speed (because we can't get rid of 700k of blocking JS) still ranks like hell, because we do all the rest right.

partiallypro · on Oct 21, 2017

Google actually doesn't use their PageSpeed score -at all- in search rankings. They may factor in speed, but it's not the PageSpeed score. Moz did a study with this a year or two ago and could find no correlation. There was a correlation with TTFB though.