Site Speed Metrics in Plain English


Quick-reference for jargon-free description of site speed metrics.

Cumulative Layout Shift
Remember the last time you tried to click a link & the link changed it’s position. And, this caused your click to land you on a different page? This metric addresses such experiences.
CLS (Cumulative Layout Shift) explained via snapshots

First Input Delay
Remember when you tap a button, link or text-box as the page is loading and nothing seems to happen forever? This metric addresses such experiences.
FID (First Input Delay) explained via snapshots

Largest Contentful Paint
The time when the largest visible content element on screen is fully displayed.
LCP (Largest Contentful Paint) explained in snapshots

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How to Accurately Measure Your PageSpeed Score

Well, can’t we just go to PageSpeed Insights or web.dev measure, slap our dear URL and know the scores? Unfortunately, the answer is ‘No’. Read on to know more..