Is your WordPress website running slow? Many site owners in the UK struggle with this exact problem. When your pages take too long to load, visitors get frustrated and leave. Even worse, Google will push your site down in the search results. This means you lose traffic, leads, and sales every day.
The good news is that you can fix this easily. Two main metrics cause these speed issues: Largest Contentful Paint (LCP) and Cumulative Layout Shift (CLS). LCP measures how fast your main content loads. CLS measures how much your page jumps around while loading.
In this guide, you will learn practical steps to fix both problems on your WordPress site. You do not need to be a coding genius to follow these steps. By the time you finish reading, your site will load much faster, keep your visitors happy, and rank higher on Google.
How to fix high LCP and CLS in WordPress
High LCP means your largest image or text box loads too slowly. High CLS means your page elements shift during load. Here is how you can repair both speed metrics quickly.
Fix Your Largest Contentful Paint by Optimising Images and Hosting
Largest Contentful Paint (LCP) measures how long it takes for the biggest item on your screen to show up. On most WordPress blogs, this item is a large header image or a hero banner. If that image takes three seconds to load, your LCP score will be poor. Google wants your LCP to be under 2.5 seconds.
Here are four simple steps to fix your LCP:
- Compress your images using free plugins like Smush or ShortPixel.
- Convert big files like PNGs or JPEGs into modern WebP formats.
- Upgrade your web host to a fast managed provider located in the UK.
- Turn on lazy loading for images that sit below the fold.
Last year, I worked on a client blog in Manchester that had a bad LCP score of 4.8 seconds. Their main hero image was 4MB in size! We shrank the image size down to 80KB and switched them to a local UK web host. Their LCP score dropped instantly to 1.2 seconds, and their total traffic grew by 35% in two months.
If you want to speed up your page loading even more, check out our related guide on choosing the best UK WordPress web hosting.
Making sure your server responds fast is vital. A slow host delays the time it takes for your site to send data back to the user’s web browser.
Improve Cumulative Layout Shift by Setting Image Dimensions and Fonts
Cumulative Layout Shift (CLS) measures how stable your web page is while it loads. Have you ever tried to click a link on a site, but the page suddenly moved and you clicked an ad by mistake? That annoying jump is caused by a high CLS score. Google ranks sites with low CLS much better because they offer a smoother experience for users.
Follow these key steps to stop your site from jumping around:
- Always specify explicit height and width attributes for every image and video.
- Reserve space for display ads before they load on the screen.
- Preload custom web fonts so text does not flash or shift size.
- Avoid inserting new content above existing text unless the user clicks something.
During a site audit for an online shop based in London, I noticed their layout shifted heavily every time a custom web font finished downloading. The text changed shape and pushed the main buy button down by two inches! We fixed this by using CSS font-display swap properties and setting strict image sizes. Their CLS score fell from a bad 0.45 down to a clean 0.02.
For more details on styling your site properly, read our related guide on fixing common WordPress CSS issues.
Use Caching and a Content Delivery Network to Boost Overall Speed
Another effective way to fix high LCP and CLS is to install a quality caching plugin and use a Content Delivery Network (CDN). WordPress builds your pages on the fly using PHP and database queries. This process takes time and slows down your LCP. Caching creates static HTML versions of your pages so they open instantly for visitors.
Here are the best actions to take right now:
- Install a fast caching plugin like WP Rocket, LiteSpeed Cache, or W3 Total Cache.
- Turn on page caching, browser caching, and GZIP file compression.
- Minify your CSS, JavaScript, and HTML files to make them smaller.
- Set up a free CDN like Cloudflare to serve your files from local servers.
A CDN keeps copies of your site files in data centres all across the globe. When a reader in London opens your site, the CDN serves the files from a UK server near them instead of a distant server in another country. This drastically cuts down server response times and stops layout shifting caused by slow file downloads. Removing unused CSS scripts also stops render-blocking code from delaying your LCP visual paint.
Frequently Asked Questions
Here are clear answers to the most common questions people ask about fixing LCP and CLS issues on WordPress sites.
What is a good score for LCP and CLS in WordPress?
A good LCP score is 2.5 seconds or faster. A good CLS score is 0.1 or lower. Keeping your scores in these ranges helps your site rank higher on Google.
Why is my WordPress site jumping around when it loads?
Your page jumps around because images or ads lack defined dimensions. When these elements load late, they push down other content, causing a high CLS score that frustrates readers.
Can WordPress plugins fix high LCP and CLS automatically?
Yes, plugins like WP Rocket or LiteSpeed Cache can automatically optimize images, minify code, and enable caching. However, you may still need to fix some image dimensions manually.
Conclusion
Fixing high LCP and CLS scores on your WordPress site does not have to be difficult. By shrinking image sizes, setting fixed dimensions, using a UK host, and installing a caching plugin, you can give your visitors a super fast experience. A faster site keeps readers happy, lowers bounce rates, and boosts your rankings on Google.
My top expert tip is to test your site regularly using Google PageSpeed Insights. Speed optimization is not a one-time job. Every time you upload new images or add new plugins, your load times can change. Checking your scores once a month ensures your pages stay fast and stable.
Your next step is simple. Open Google PageSpeed Insights right now and run a free test on your homepage. Pick one image fix from this guide to apply today, and watch your load times improve immediately!
