Does Website Speed Affect SEO?

Have you ever clicked on a website, only to find yourself waiting for the page to load?

I’m sure we’ve all been there, and it’s massively frustrating. Even a short delay can be enough to make you leave a website before finding what you were looking for.

So, what happens when it’s your website that’s slow? Your customers feel that same frustration, and some will leave before they’ve got in touch or bought anything. And the impact doesn’t stop with your visitors, because a slow website can also affect your SEO. Speed is only one part of the picture, though, alongside things like helpful, trustworthy content and links from other websites.

In this guide, we’ll explain how speed affects your search performance and your business, and how to work out what to fix first.

How does website speed affect SEO?

Google has confirmed that its ranking systems use Core Web Vitals (a set of measures of how quickly and smoothly a page loads), so speed does play a part in rankings.

That said, the quality and relevance of your content still come first. Google says it will always try to show the most relevant page, even if it’s a little slow. So a fast website alone won’t guarantee that you’ll outrank a competitor with a slower one, but it certainly doesn’t hurt.

Speed also has a knock-on effect on how people use your site. When pages load quickly, visitors tend to stick around longer, look at more pages and are less likely to leave straight away. Google has said it doesn’t use Google Analytics data like bounce rate or session duration to rank pages, but they’re still good signs for your business, because engaged visitors are more likely to get in touch or buy.

What are Core Web Vitals?

Core Web Vitals are Google’s way of measuring what a page is actually like to use. Google sets a target for each of the three Core Web Vitals metrics:

Largest Contentful Paint (LCP): how quickly the main content of the page appears. Google’s target is within 2.5 seconds.

Interaction to Next Paint (INP): how quickly the page responds when someone clicks, taps or types. Google’s target is under 200 milliseconds.

Cumulative Layout Shift (CLS): how much the layout jumps around while the page loads, like a button moving just as you go to tap it. Google’s target is a score below 0.1.

Google measures these using data from real visitors, and a page passes when at least 75% of visits hit each target.

They’re worth keeping an eye on because they reflect what your visitors actually experience. Just don’t get too hung up on perfect scores. Google’s ranking systems take Core Web Vitals into account, but chasing perfection purely for SEO is rarely the best use of your budget.

Does website speed differ between desktop and mobile?

One thing you’ll quickly notice when measuring your site’s speed is that mobile and desktop perform differently, with mobile usually the slower of the two.

That’s partly because phones can have slower, less reliable connections and less processing power than a desktop computer. If your site has large images or complex scripts that haven’t been optimised for mobile, your mobile visitors will feel it most.

Optimising a website for mobile is essential since Google mainly uses the mobile version of your website for indexing and ranking. Our guide to mobile optimisation covers this in more detail. It’s still a good idea to check Core Web Vitals on both devices, so your site works well whichever one your customers are using.

You can use PageSpeed Insights to test your pages on mobile and desktop. Comparing the two can help you spot issues that affect one more than the other, so you know where to focus.

How can you check and improve your website speed?

Speed data comes in two types, and it helps to know the difference. Google PageSpeed Insights shows both:

• • Its 0–100 score comes from a lab test, which is a one-off simulated visit to the page.
  • If a page gets enough traffic, you’ll also see how real Chrome users have experienced it over the past 28 days.

Real-visitor data gives a much more accurate picture, so if the two disagree, that’s the one to trust. Tools such as GTmetrix run lab tests, which are handy for diagnosing problems on a specific page.

For a view across your whole site, Google Search Console also shows Core Web Vitals issues based on real visitors, grouped by similar pages. It’s a good place to start.

A few quick wins to speed up your site:

Compress and resize images – large images are one of the most common causes of slow pages. Compressing them, resizing them to the size they appear on screen and using modern formats such as WebP all help them load faster.

Remove scripts you don’t need – old tracking tags, unused plugins and widgets such as chat tools all add weight to a page, so removing or delaying the ones you don’t need can make a noticeable difference.

Lazy-load images further down the page – this means images only load as visitors scroll towards them. Just don’t do this for the main image at the top of the page, as it can slow down how quickly it appears.

Use caching – this stores files in a visitor’s browser, so pages load more quickly the next time they visit.

Review your hosting – cheap or overloaded hosting can slow down every page on your site, however well it’s built.

Not every speed issue needs fixing straight away. Start with the pages that matter most to your business, such as your top landing pages, key product or service pages, and your booking or checkout process.

Look at mobile first, since that’s the version Google uses and often where most of your visitors are. Then tackle the issues that have the biggest effect on how quickly your main content appears, such as oversized images and third-party scripts, before moving on to smaller technical tweaks.

Why does website speed matter for business results? 

Slow or unresponsive pages get in the way of the things you want visitors to do, whether that’s making an enquiry, booking or buying.

For example, if someone wants to buy something but the product page takes too long to load or doesn’t respond when they tap, there’s a good chance they’ll head to a competitor instead.

Google’s own research for retailers found that a one-second delay in mobile load times can affect mobile conversions by up to 20%.

That’s why we look at conversion rates and user behaviour alongside the technical numbers, to see whether speed is actually holding your business back. A simple place to start is to find your slowest key pages in Google Search Console, then compare their conversion rates with your faster pages in Google Analytics.

Speeding up your site can support better results, but it won’t guarantee more sales or higher rankings on its own. It’s one part of your wider SEO strategy, so it’s worth focusing on what makes the biggest difference to your business.

When should you seek technical SEO support?

If Google Search Console is flagging poor Core Web Vitals across lots of pages, or your site is still slow after you’ve made the basic improvements, it might be time to bring in some technical help.

A developer or technical SEO specialist can dig into the more complex causes, such as heavy JavaScript or inefficient code, and recommend the right fixes.

It’s also worth getting help if problems are affecting your most important pages, like service pages, booking forms or checkout. Fixing these can make things smoother for your visitors and make it easier for them to take the next step.

If you’d like a second pair of eyes on your website’s speed and SEO, book a free digital audit with our team and we’ll show you where to focus first.

Frequently asked questions 

What is a good website speed for SEO?

There’s no single loading time that guarantees good SEO performance. The best benchmark is Google’s Core Web Vitals targets, based on real visitors: your main content appearing within 2.5 seconds, the page responding to interactions in under 200 milliseconds and a layout shift score below 0.1. A high PageSpeed Insights score is a useful guide, but it comes from a lab test, so it won’t always match what your visitors experience.

What are the quickest ways to make my website faster?

Compressing your images and turning on caching are two of the quickest wins. After that, removing scripts you don’t need and looking into any technical issues can help you speed things up further.

How can I check my website speed? 

Tools such as PageSpeed Insights or GTmetrix let you check your speed on both mobile and desktop. For a site-wide view based on real visitors, take a look at the Core Web Vitals report in Google Search Console.