TL;DR: This is how to improve core web vitals: get LCP under 2.5 seconds, INP under 200 milliseconds and CLS under 0.1. Most WordPress sites miss these thresholds because of fixable issues like slow hosting or heavy scripts.
What are core web vitals and why do they matter for SEO?
Google gives your homepage two and a half seconds to load its main content. Miss that window and your page can lose ground in search results, even when the content itself is good. Most site owners only ever hear “the site feels slow” from a developer. They rarely get a real explanation of what’s causing it or what to fix first.
Core Web Vitals are three scores Google uses to judge how a page feels to use. Loading speed is the first, checking how fast your main content appears. Responsiveness comes next, checking how quickly the page reacts to a click. Visual stability is the third, checking if content holds still as it loads.
Google has confirmed these scores form part of its ranking systems. Two pages with similar content can rank differently once these numbers come into play. This matters most on your service pages and contact form, the parts of your site actually generating enquiries.
Google ran this research with SOASTA in 2017 and published it via Think with Google. It found that as load time goes from one second to five seconds, the probability of a mobile visitor bouncing rises by 90%. Source: Think with Google, 2017 That means most of your paid traffic is gone before your offer even loads.
What is a good Largest Contentful Paint score?
Largest Contentful Paint, known as LCP, measures how long the biggest visible element takes to load. Usually that’s a hero image or a large block of text. Google wants this under 2.5 seconds for most visits.
What causes slow LCP on a typical business website?
Two things usually slow LCP down, particularly on WordPress sites, which run a large share of UK small business websites.
Large, uncompressed images
A hero image exported at full resolution can run to several megabytes. Compressing it and converting it to WebP usually halves that file size with barely any visible difference.
Slow or shared hosting
A hosting plan shared with hundreds of other sites eats into your loading budget before the page starts rendering. A managed WordPress host usually fixes this without touching your design.
Our web design team builds performance into every site from the start, covering image handling and hosting setup together. If you’re not sure which of these applies to your site, we can run a quick audit and show you where the time is going.
What is a good Interaction to Next Paint score?
Interaction to Next Paint, known as INP, measures how quickly your page responds once someone clicks or taps something. Google wants this under 200 milliseconds. Slower than that, and the page feels unresponsive even if it loaded fast.
What usually causes poor INP scores?
Too many scripts running at once
Chat widgets and tracking tags each take processing time, and cookie banners often add more on top. When several load together, the browser can’t keep up with a click until it clears the queue.
Heavy JavaScript on key pages
Long-running scripts block the browser from responding to input. Breaking these into smaller tasks brings INP back under 200 milliseconds.
What is a good Cumulative Layout Shift score?
Cumulative Layout Shift, known as CLS, measures how much your page moves as it loads. Google wants this under 0.1. A CLS problem is the moment you go to tap a button and the page shifts, so you tap an advert instead.
What usually causes layout shift?
Images and embeds without set dimensions
If a browser doesn’t know an image’s size in advance, it can’t reserve space for it. Adding width and height attributes to every image and video fixes most CLS issues on its own.
Fonts that swap in after the page loads
A custom font replacing a fallback font partway through loading can reflow text and shift the layout. Preloading your main font file avoids this.
How do you check your core web vitals score?
Google Search Console gives you real data from actual visitors. PageSpeed Insights and Lighthouse test a single page under lab conditions instead. That’s useful for checking a fix on a staging site or an unpublished page before you roll it out everywhere. These lab results won’t always match Search Console exactly, since one reflects real visits and the other simulates a single run.
How can Netzoll help improve your core web vitals?
At Netzoll, core web vitals work starts with your actual Search Console data. We trace each failing score back to its specific cause on your site, then fix that cause directly. Our on-page and off-page SEO work sits alongside this, since content structure and site speed both affect the same rankings.
If you’d like a second opinion on where your site is losing time, get in touch and we’ll show you exactly what we find.
Knowing how to improve core web vitals is what separates the pages outranking yours from the ones that don’t.