What it is
Core Web Vitals are three specific measurements of how a page feels to use. Largest Contentful Paint tracks how fast the main content appears. Interaction to Next Paint tracks how quickly the page reacts when someone taps or clicks. Cumulative Layout Shift tracks how much things jump around as the page loads. Google measures them from real visits, not a lab test.
Why it matters
This is the people audience, measured. A slow, janky page loses visitors before they read a word, and Google uses these scores as a ranking signal. The same speed and stability that help people also help the machines: a page that renders fast and predictably is easier for search engines and AI crawlers to read in full. Poor vitals quietly cap how well everything else you do can perform.
What to do
Pull your scores from Google Search Console or PageSpeed Insights, which use real-world data. Tackle the biggest offenders first: oversized images, render-blocking scripts, and elements with no reserved space that cause shifts. Re-measure after each fix. Run WAIO Engine to see how performance factors into your overall AI readiness.