# Core Web Vitals in 2026: why page speed still matters

- Link: https://eprefix.co.uk/core-web-vitals-2026/
- Published: 2026-08-26T10:00:00+00:00
- Author: jameszxr

Core Web Vitals are Google’s measures of how a page feels to the people using it:
how quickly it loads, how quickly it responds, and whether it jumps around while
it does. They’re part of how Google ranks pages, and more importantly, they track
closely with whether visitors stay or leave.

## The three numbers

 * **Largest Contentful Paint (LCP)** is how long the main content takes to appear.
   Aim for 2.5 seconds or less.
 * **Interaction to Next Paint (INP)** is how quickly the page responds when someone
   taps or clicks. Aim for 200 milliseconds or less. INP replaced the older First
   Input Delay measure in March 2024.
 * **Cumulative Layout Shift (CLS)** is how much the layout moves while the page
   loads. Aim for 0.1 or less.

Google measures these from real visits in Chrome and looks at the 75th percentile,
so three out of four visits need to hit the target, not only the ones on fast office
broadband.

## How to check your site

Put your address into [PageSpeed Insights](https://pagespeed.web.dev/). The section
at the top shows real visitor data if your site gets enough traffic. If you use 
Google Search Console, its Core Web Vitals report shows which groups of pages pass
and which need work.

## Why sites miss the targets

 * **Large images.** A photo straight off a camera can be several megabytes. Resizing
   and serving it as WebP or AVIF often cuts that by 90%.
 * **Too many plugins and scripts.** Page builders, sliders, chat widgets and tracking
   tags all add code that the browser has to download and run, which hurts INP in
   particular.
 * **Slow hosting.** If the server takes a second to respond, the page can’t start
   loading until it does. Cheap shared hosting is a common cause.
 * **Missing image sizes.** Images, embeds and banners without set dimensions push
   content down as they load, which is what CLS measures.

## How we build for speed

We hand-build lightweight WordPress themes instead of using heavy page builders,
size and compress images properly, and host sites on tuned servers with caching.
Speed is designed in from the start rather than fixed afterwards. If your site is
slow, [get in touch](https://eprefix.co.uk/#contact) and we’ll tell you what’s holding
it back.