Website Speed: How to Test It and How to Make Your Site Load Faster

Website speed is how quickly a page loads and becomes usable. A slow website annoys visitors, lowers conversion and can hurt search rankings. For a user speed is not “seconds in a report” but a feeling: the content has appeared, the button can be pressed and the page does not jump under the finger. One thing matters: a fast website is not only about comfort, it directly affects the money you invest in advertising and SEO.

Why website speed matters

• Conversion. The longer a page loads, the more people leave without waiting for the form or the button.
• Bounce. A slow page on mobile internet is often closed before the first screen appears.
• Search results. Page speed and usability metrics are among the signals Google takes into account.
• Advertising. Paid traffic to a slow page is lost right at the entrance, so the budget is wasted.
• Brand impression. A slow website feels unreliable.

What Core Web Vitals are

Core Web Vitals are a set of Google metrics that evaluate how a user perceives a page. The three main ones are:

These are the benchmarks Google considers good. Look at them separately for the mobile and desktop versions: results on a phone are usually worse.

How to test website speed

1. Run PageSpeed Insights. Google’s free tool shows the metrics for mobile and desktop and hints on how to fix them.
2. Open the Core Web Vitals report in Search Console. It shows how many pages of your site fall into “good”, “needs improvement” and “poor” based on real user data.
3. Use Lighthouse in Chrome. The built-in audit shows problems right in the browser.
4. Check on a real phone. Open the website over mobile internet, not only over Wi-Fi.
5. Check key pages. Not only the home page: service pages, articles, the cart and request forms.
6. Compare lab and real data. A test shows the potential, while user data shows how the page is actually seen.

What most often slows a website down

• Heavy images. Large uncompressed files in outdated formats.
• Many scripts and plugins. Each one adds requests and delays, especially on WordPress.
• Weak hosting. A slow server response affects the entire site.
• No caching. The page is rebuilt every time.
• External widgets and fonts. Chats, videos, pixel codes, endless rows of styles.
• Unoptimized code and theme. Extra libraries loaded on every page.

How to speed up a website

1. Compress images. Use modern formats (for example, WebP) and fit the size to the place on the page.
2. Turn on lazy loading. Images and videos below the first screen load only when the user gets to them.
3. Set up caching. Ready pages are served faster than they are created on the fly.
4. Minify and combine CSS and JavaScript. Remove the unnecessary and defer what is not needed on the first screen.
5. Remove extra plugins and third-party scripts. Keep only those that bring value.
6. Use a CDN. Files are served from the server closest to the user.
7. Choose good hosting. It determines the base response speed.
8. Optimize fonts. Fewer font styles and correct loading reduce delays and layout jumps.

We do all of this within our website speed service, and the technical basics for search are described on the technical SEO page. For WordPress projects we have a separate WordPress development service.

Where to start

1. Measure the current state. Record the metrics of key pages on phone and desktop.
2. Find the biggest impact. Usually it is images and third-party scripts.
3. Fix the most important. Start with pages that bring leads.
4. Measure again. Check whether the metrics improved, and only then move on.

Speed is part of the mobile convenience we wrote about in the article “Mobile adaptation”, and one of the components of modern search promotion that we covered in “SEO in 2026”.