What Core Web Vitals Actually Measure

Core Web Vitals get thrown around as a technical SEO term, but the idea behind them is simple: they measure how a page actually feels to use, not just how fast it loads on paper.

The three metrics that make up the score

• Largest Contentful Paint (LCP): how long the main content takes to appear, ideally under 2.5 seconds
• Interaction to Next Paint (INP): how quickly the page responds after a visitor taps or clicks something
• Cumulative Layout Shift (CLS): how much content jumps around while the page is still loading, which is what causes a misclick on a phone

Why Google cares, and why you should too

Core Web Vitals are a confirmed Google ranking factor, but the bigger cost is not rankings, it is visitors. A page that feels slow or jumpy loses people before they ever read a word of your copy, regardless of where it ranks.

What actually slows small business sites down

• Full-resolution photos uploaded straight from a phone instead of compressed and properly sized
• Builder platforms that load scripts for features the page never uses
• Fonts, widgets and tracking scripts stacked on top of each other with no one checking the total cost

This is exactly what a technical audit catches before it becomes a ranking problem, and it is one of the first things we check in every redesign. See our Site Redesign service

Checking your own score

Google publishes the exact thresholds for a passing score and a free tool to test any URL against them, which is worth running before assuming a slow-feeling site is just an impression. Read Google's Core Web Vitals documentation