Glossary
Page Speed
Page speed is how quickly a page becomes visible and usable. It is measured two ways (in a controlled laboratory test, and from what real visitors actually experienced), and the two frequently disagree.
Glossary
Page speed is how quickly a page becomes visible and usable. It is measured two ways (in a controlled laboratory test, and from what real visitors actually experienced), and the two frequently disagree.
Field data records what happened to real visitors on their own hardware, which is what search engines assess and what customers experience.

It means the test machine is faster than your audience's, and the audience is the one that matters.
Speed is a modest ranking input that mainly separates otherwise similar pages; its effect on abandonment and conversion is direct and much larger.
Because the assessment uses field data from real visitors, whose devices and networks are usually slower than the test environment. The field figure is the one search engines and customers experience.
Modestly, and mainly between pages of similar relevance. The stronger case for fixing it is abandonment and conversion, where the effect is direct.
Page speed is how quickly a page becomes visible and usable. It is measured two ways (in a controlled laboratory test, and from what real visitors actually experienced), and the two frequently disagree.