Website Speed in 2026: Core Web Vitals Explained

A slow website costs you leads before visitors read a single word. Google measures real-world speed with three numbers called Core Web Vitals, and they show up in Search Console for every site.

The three numbers that matter

Metric	What it measures	Good score
LCP (Largest Contentful Paint)	How fast the main content appears	2.5 seconds or less
INP (Interaction to Next Paint)	How quickly the page responds when someone taps or clicks	200 milliseconds or less
CLS (Cumulative Layout Shift)	How much the layout jumps around while loading	0.1 or less

Google looks at these for real visitors, mostly on phones, so test on mobile first.

How to check your site

• PageSpeed Insights (pagespeed.web.dev) shows real-user data and lab tests for any URL
• Google Search Console has a Core Web Vitals report that groups problem pages
• Your own phone on cellular data is the most honest test of all

Fixes for slow LCP

• Compress and resize images, and serve modern formats like WebP or AVIF
• Load the main hero image first instead of lazy-loading it
• Use fast hosting with a CDN
• Cut heavy sliders, background videos, and page builders that load lots of code

Fixes for poor INP

• Remove plugins, widgets, and tracking scripts you don't use
• Load chat widgets and third-party scripts after the page is interactive
• Avoid huge pages that run a lot of JavaScript on every tap

Fixes for layout shift (CLS)

• Set a width and height on every image and video
• Reserve space for banners, ads, and embeds
• Load fonts in a way that doesn't make text jump

Speed is a marketing decision

If you run ads, every slow second wastes money you already paid for the click. A fast, simple landing page usually beats a flashy one. That's why every site we build is lightweight by default.

Want to know how your site scores? Let's talk and we'll run the numbers with you.