A plain-language explanation
Page speed describes the time and smoothness with which a website loads content, responds to user input, and maintains visual stability.
Where it helps in practice
Page speed includes content appearance, responsiveness and visual stability rather than document download time alone.
The decision before implementation
Prioritise high-impact templates and real devices, set resource budgets and assign regression ownership.
How to verify the result
Combine field and lab data and review LCP, INP, CLS, errors and business outcomes after changes.
