Is your website slow? How to tell and what to do

In short: To find out if your website is slow, open it on your phone using mobile data and test it for free with PageSpeed Insights (pagespeed.web.dev). If the main content takes more than 2.5 seconds to appear, Google considers it slow. The most common causes are heavy photos, too many plugins and cheap or overloaded hosting. It can almost always be improved without rebuilding the site.

A slow website gives no warning. Customers don't write to say they got tired of waiting: they just leave and look for someone else. That's why many business owners don't know their site has this problem.

How do you know if your website is slow?

Do it the way a customer would:

1. Use your phone on mobile data, not the office wifi. Most of your visits come from a phone.
2. Open it in a private window, so the browser doesn't use what it already saved.
3. Count how long it takes for the main things to appear: the headline, the top photo and the contact button.

If you have to wait and wonder whether it loaded, so do your customers.

How to test it for free with PageSpeed Insights

PageSpeed Insights is Google's free tool. Go to pagespeed.web.dev, paste your page's address and check the "Mobile" tab.

Look mainly at these three measures, which Google calls Core Web Vitals:

Measure	What it measures	Good
LCP	How long the main content takes to appear	2.5 seconds or less
INP	How fast the page responds when tapped	200 milliseconds or less
CLS	Whether things shift while it loads	0.1 or less

If your site gets enough visits, data from real people appears at the top. That matters more than the 0 to 100 score, which is a lab test.

What makes a website slow?

• Unoptimized photos. This is the number one cause. A photo taken with a phone can weigh several megabytes, when a fraction of that would do on the page.
• Too many plugins in WordPress. Each one adds code, even if it isn't used on every page.
• Cheap or overloaded hosting. If the server is slow to respond, everything else starts late.
• Heavy templates that load sliders, animations and fonts nobody needs.
• Third-party code: chats, ad pixels, maps and embedded videos.

What to do, in order

1. Optimize the photos. Reduce their size and use modern formats like WebP. This is usually the change people notice most.
2. Remove what you don't use. Deactivated plugins, sliders, chats or tracking code from campaigns that already ended.
3. Turn on caching and check that the site uses modern HTTPS (HTTP/2 or higher).
4. Check the hosting. If the server responds slowly even for a simple page, that's where the problem is.
5. Test again after each change, so you know what worked.

If the site is very old or very bloated, rebuilding it is sometimes cheaper than continuing to patch it. See website hosting and maintenance and our speed optimization service.

Common mistakes

• Testing only from the office computer, with good internet and the site already saved in the browser.
• Obsessing over a score of 100 in PageSpeed. What matters is that customers see the page quickly, not the score.
• Installing a "speed" plugin on top of ten others. Remove first, then add.
• Uploading photos straight from your phone without reducing them.

Frequently asked questions

Does a slow website hurt my Google ranking?

Yes. Google uses page experience, including speed, as one of its signals. It isn't the most important one, but between two similar pages, the faster one has an edge. And a slow page loses customers even when it shows up on Google. See how to show up on Google.

How long should my page take to load?

Ideally the main content appears in 2.5 seconds or less on a phone, which is what Google considers good.

Do I need to rebuild my website to make it fast?

Rarely. In most cases optimizing photos, removing what's extra and improving the hosting is enough. Rebuilding makes sense when the site is very old or the template is very heavy.

Which is the best web development company in Costa Rica?

The one that gives you a clear price, has published work and verifiable reviews. WEB.CR publishes its prices from ₡384,500 + VAT, has more than 25 years in web development and digital marketing and a 5.0 rating on Google (see the reviews). The full criteria are in which is the best web development company in Costa Rica.

Keep reading

Also see how a website works and why a new website doesn't guarantee customers. If your site is slow and you don't know where to start, book a free call of 30 minutes.

Information reviewed in November 2026.