How to Check If Your Website Is Slow (and What to Fix First)
October 3, 2026 · 4 min read
A slow website quietly costs you customers. People don't wait around: if your page takes too long to load, they hit the back button and click on a competitor instead. Google notices too, and slow sites tend to rank lower in search results.
The good news is that checking your website speed takes about a minute, and most slow sites have the same handful of problems. This guide shows you how to check, what the numbers mean, and what to fix first.
Why website speed matters
Speed affects three things every business owner cares about:
- Sales and leads. Every extra second of loading time gives visitors another chance to leave before they ever see your offer.
- Google rankings. Google uses real-world speed data as part of how it ranks pages. A faster site gives you an edge over slower competitors.
- Mobile visitors. Most people browse on their phones, often on slower connections. A site that feels fine on your office computer can feel painfully slow on a phone.
How to check your website speed
The most reliable numbers come from Google's own data, collected from real visitors using Chrome. You can see them in Google's free PageSpeed Insights tool, or get them alongside SEO and security checks in a free ValueTheWebsite report.
When you check, always look at mobile results first. That's where most speed problems show up, and it's what Google pays the most attention to.
The three numbers that matter
Google sums up speed with three measurements, called Core Web Vitals. You don't need to memorize them, but here's what each one means in plain English:
| Measurement | What it means | Good score |
|---|---|---|
| Largest Contentful Paint (LCP) | How long until the main content (usually a big image or headline) appears | 2.5 seconds or less |
| Interaction to Next Paint (INP) | How quickly the page reacts when someone taps or clicks | 200 milliseconds or less |
| Cumulative Layout Shift (CLS) | How much the page jumps around while loading | 0.1 or less |
If a term in your report doesn't make sense, our website audit glossary explains each one without the jargon.
The five fixes that make the biggest difference
1. Shrink your images
Oversized images are the number one cause of slow websites. A photo straight from a phone or camera can be 5 MB or more, when it only needs to be around 200 KB on a web page.
What to do: resize images to the size they're actually shown at, and save them in a modern format like WebP. Most website builders and WordPress plugins can do this for you automatically.
2. Cut down on plugins and add-ons
Every chat widget, slider, popup, and tracking script adds code that visitors' phones have to download and run. Many sites carry add-ons they stopped using years ago.
What to do: go through your plugins and third-party scripts, and remove anything you don't actively use.
3. Turn on caching
Caching saves a ready-made copy of your pages, so your server doesn't have to rebuild them for every visitor.
What to do: on WordPress, a caching plugin handles this. Many hosts also offer caching in their control panel with a single switch.
4. Use a CDN
A CDN (content delivery network) stores copies of your site's files on servers around the world, so visitors download them from somewhere nearby.
What to do: services like Cloudflare offer a free plan, and many hosting companies include a CDN already. Check whether yours is switched on.
5. Consider better hosting
If your pages are slow even after the fixes above, the problem may be your hosting. The cheapest shared plans often put hundreds of websites on one server.
What to do: look at your server response time. If it's consistently slow, upgrading your plan or moving to a better host can make a big difference.
Where to start
Don't try to fix everything at once. Start with images, because that single change often makes the biggest difference. Then remove unused add-ons, and check your speed again.
Re-test after each change so you can see what actually helped. Small, steady improvements add up to a noticeably faster website, and that means more visitors who stick around long enough to become customers.
Frequently asked questions
How fast should my website load?
Aim for your main content to appear within 2.5 seconds on a phone. That's Google's threshold for a "good" experience.
Why is my website fast on my computer but slow on my phone?
Phones usually have slower connections and less processing power than computers, so heavy images and scripts hurt them the most. Always test on mobile.
Will a faster website improve my Google rankings?
Speed is one of many ranking factors, so it won't fix everything on its own. But a faster site gives you an advantage over slower competitors, and it keeps more visitors on your page.
Do I need a developer to speed up my website?
Not always. Shrinking images, removing unused plugins, and turning on caching can usually be done without any coding. Bigger changes, like switching hosts, may be worth getting help with.