What “fast” means for a business website
Speed isn’t one number. Here are the three measurements Google uses, and what each means for the people visiting your site.
“Make it fast” is in almost every website brief, but fast isn’t a single number. Google’s Core Web Vitals break it into three measurements, each tied to something a visitor actually feels.
Largest Contentful Paint: how quickly it shows up
LCP measures how long the main content — usually a hero image or headline — takes to appear. Google considers 2.5 seconds or less good. Oversized images and slow servers are the usual causes.
Interaction to Next Paint: how quickly it responds
INP measures the delay between a tap or click and the page visibly reacting. 200 milliseconds or less is good. Heavy JavaScript, chat widgets and tracking scripts are the common reasons pages feel sluggish.
Cumulative Layout Shift: whether it stays still
CLS measures how much the layout jumps while loading — the reason you sometimes tap the wrong button. A score of 0.1 or less is good. Images without set dimensions and late-loading banners cause most shifts.
What it means in practice
Most speed problems are decided long before launch: by the size of the hero image, the number of scripts on the page and the hosting the site runs on. That’s why performance belongs in the design stage, not in a clean-up once the site feels slow.
You can check any page yourself with Google’s free PageSpeed Insights. Test the page your customers land on most, and test it on mobile.