Are you looking to take your website to the next level but worried that your site speed is holding you back? Unsure whether poor site speed will even affect your SEO?
In this article, we’ll break down what site speed means in 2026, how it is measured, and what impact it has on your rankings, user experience, and overall SEO strategy.
TL;DR:
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Site speed is a catch-all term referring to
how fast a browser can load your webpages and their content
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Site speed scores:
- 90–100: Good
- 50–89: Needs improvement
- 0–49: Poor
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Site speed scores:
- Google confirmed in 2022 that site speed is a ranking factor, but it is now measured by Core Web Vitals and isn’t a distinct metric
- Site speed also impacts user engagement, experience, and retention
Jump To:
- What is site speed?
- How is site speed measured?
- How and why does site speed impact seo & rankings?
- How and why does site speed impact the user experience?
- When should I prioritise site speed fixes?
- How can Wildcat Digital help?
What is Site Speed?
Site speed refers to two things:
- How fast a browser can load a page from your website
- How well content on a page loads and performs
You can use Google’s free official tools — PageSpeed Insights or Lighthouse Reporting — to determine your website’s site speed score.
What is a Good Site Speed Score?
| Icon | Score | Meaning |
|---|---|---|
| 90–100 | Good | |
| 50–89 | Needs improvement | |
| 0–49 | Poor |
Source: Google Documentation
How is Site Speed Measured?
‘Page speed’ was once a metric of its own, but now Google measures overall site speed and performance using a group of metrics called Core Web Vitals, which include:
- Interaction to Next Paint (INP)
- Largest Contentful Paint (LCP)
- Cumulative Layout Shift (CLS)
Core Web Vitals: Interaction to Next Paint (INP)
INP measures your page’s responsiveness when a user interacts with it, most notably by tapping, clicking, and scrolling.
INP is more about visual responsiveness than technical responsiveness; it’s about making sure the user knows that their input was actually registered.
| Icon | Score | INP |
|---|---|---|
| 90–100 | 200 ms or less | |
| 50–89 | 200 ms – 500 ms | |
| 0–49 | More than 500 ms |
Core Web Vitals: Largest Contentful Paint (LCP)
LCP measures how long it takes to render the largest piece of content on your page, such as an image, video, or block of text, when a user first arrives on the page.
| Icon | Score | LCP |
|---|---|---|
| 90–100 | 2.5 sec or less | |
| 50–89 | 2.5 sec – 4.0 sec | |
| 0–49 | More than 4.0 sec |
Core Web Vitals: Cumulative Layout Shift (CLS)
CLS measures how impactful sudden shifts in the page’s layout are on the user experience. Sometimes, content moving on the page is expected, and other times it can cause issues.
For example, a sudden layout shift could cause a user to hit ‘Buy’ when they meant to click ‘Cancel’. This can cause real frustrations or issues, leading Google to deprioritise your page.
| Icon | Score | CLS |
|---|---|---|
| 90–100 | 0.1 or less | |
| 50–89 | 0.1 – 0.25 | |
| 0–49 | More than 0.25 |
How and Why Does Site Speed Impact SEO & Rankings?
Site speed is a direct ranking factor in Google’s algorithm. If Google assesses that your website loads slowly, it will prioritise ranking a competitor’s faster-loading webpage over yours.
To determine which pages rank above others, Google looks for particular signals. Google Search assesses whether your page:
- Matches the meaning of the user’s query topic
- Is relevant to the user’s query
- Features quality, trustworthy content
- Is usable and accessible for humans — site speed impacts this majorly
- Fits the user’s specific context
Google prioritises faster-loading webpages in SERPs because it wants to guarantee a high-quality user experience. This is what is meant by “usable and accessible for humans.” We will go more into how bad site speeds impact the user experience in the next section.
How and Why Does Site Speed Impact the User Experience?
Slow-loading pages tend to have higher bounce rates because, simply, people get impatient waiting for websites to load (especially when they know the next link down in the search results pages will probably be as useful as this one and will load faster).
Site speed alone can be too broad to understand the complete user experience, though. This is where Core Web Vitals can be used to identify specific pain points.
Impact on UX: Interaction to Next Paint (INP)
- ‘Poor’ INP: Users believe that inputs are not being registered, so may click buttons more times than necessary or struggle to access information in dropdown tabs.
- ‘Good’ INP: Users are confident that their input has been registered and don’t overinteract.
Impact on UX: Largest Contentful Paint (LCP)
- ‘Poor’ LCP: Content at the top of the page takes more than 4 seconds to load, delaying users from engaging and creating friction as content loads in after they’ve scrolled past it.
- ‘Good’ LCP: Content at the top of the page loads in less than 2.5 seconds, allowing users to immediately begin scrolling without missing anything.
| LCP Case Study: In 2021, Vodafone partnered with Google to see if they could increase sales by improving their LCP. They were successful! Following a 31% improvement in LCP times (from 8.3 seconds down to 5.7 seconds), Vodafone’s total sales increased by 8%. |
Impact on UX: Cumulative Layout Shift (CLS)
- ‘Poor’ CLS: Elements move around the page erratically, interrupting users while they scroll. Poor CLS can also cause users to unintentionally hit buttons with unpredictable consequences.
- ‘Good’ CLS: The page does not move unpredictably once a user is already scrolling, guaranteeing that any engagement is completely intentional.
When Should I Prioritise Site Speed Fixes?
You should prioritise fixing site speed issues if pages take more than 3 seconds to load.
This is particularly important on high-converting pages like service landing pages, the homepage, and the contact page.
When Not to Prioritise Site Speed Fixes
You should not prioritise site speed fixes if there are more pressing content, technical, or quality issues, for example:
- Fundamental content is missing from core landing pages
- Conversion tracking in GSC/GTM is not set up correctly
- Core pages are not being crawled by search engines
There’s never a perfect time to fix any one of these issues over another; it’s all about balancing the consequences of each issue.
How Do I Audit and Improve My Site Speed?
To understand your website’s performance and overall site speed, use the following free tools:
Find out the full process for auditing site speed and making improvements by reading our blog: How to Complete a Site Speed Audit & Improve Performance
Boost Your Site Speed with Support From Wildcat Digital
With site speed being such an important factor for your overall SEO strategy, it’s important to get it right. At Wildcat Digital, our technical team are adept at completing technical optimisations of your site to ensure that pages load quickly and efficiently.
Get in touch with Wildcat’s expert team to discuss your website’s needs, or check out our digital marketing cost calculator for an instant quote on our technical and SEO services.
