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This large scenic image is the Largest Contentful Paint candidate — the metric that measures how long the biggest visible element takes to render. Aim for an LCP of 2.5 seconds or less by optimizing images, lazy-loading noncritical assets, and using efficient formats and compression
This primary blue button is the interaction the user just clicked; Interaction to Next Paint (INP) measures the delay from that click to the next visual update. A good INP is under 200 milliseconds, so minimize main-thread work and ensure fast event handlers
The dashed content block that moved downwards is an example of layout shift measured by Cumulative Layout Shift (CLS). CLS quantifies unexpected movement; a healthy score is 0.1 or less, achieved by reserving space for images, ads, and embeds to prevent jumps
The globe/cloud icon represents the CDN or server edge feeding the page; Time to First Byte (TTFB) reflects how quickly the server responds. While not a Core Web Vital, lower TTFB helps all rendering metrics start sooner, so use caching, edge locations, and optimized backend responses