Page Speed
In one sentence
How long a page takes from request to being usable.
Analogy Mental model
How long the kitchen takes. Three minutes with nothing on the table and the customer leaves and writes about it.
In practice What you actually do
Field data first, because lab scores flatter the site. Then the usual sequence: images, fonts, third-party scripts, server response. Measure on a mid-range phone over a throttled connection, since that is the median visitor.
Where people get burned Pitfalls
Optimising the lab score while field data stays flat is a common and expensive mistake. The lab tests one page on one machine; the field measures your actual audience on their actual devices.
This entry was written in English from the Chinese original, not machine-translated. Read the Chinese version →