Most visitors decide whether to stay on your website within a few seconds. Google measures that experience with three numbers called Core Web Vitals. You do not need to be technical to use them. You need to know the targets, how to test your own site for free, and which fixes matter most.
Key takeaways
- Aim for 2.5 seconds or less for the main content to appear.
- Test on mobile, using free tools, and check your most important pages.
- Images and hosting usually matter more than anything else.
The three numbers, in plain language
LCP
Largest Contentful Paint
How long until the main part of the page appears
✅ Good: 2.5 seconds or less
❌ Poor: more than 4 seconds
INP
Interaction to Next Paint
How quickly the page reacts when someone taps or clicks
✅ Good: 200 ms or less
❌ Poor: more than 500 ms
CLS
Cumulative Layout Shift
How much the page jumps around while loading
✅ Good: 0.1 or less
❌ Poor: more than 0.25
Google judges these at the 75th percentile of real visits. In simple terms, three out of four visitors should get the good experience, so one fast test on your own fast connection proves very little. INP replaced an older measure called First Input Delay in March 2024.
Why this matters for Kenyan businesses
85.5M
mobile connections
DataReportal counted 85.5 million cellular mobile connections in Kenya in October 2026, equal to 145 percent of the population. That counts connections, not people, but it shows that your customers are almost all on a phone, often on a connection that is slower or less stable than the office Wi-Fi your designer tested on. A site that loads in two seconds on fibre can take far longer on a busy mobile network.
⚠️ An honest note about rankings
Google says good Core Web Vitals line up with what its ranking systems try to reward, but it is one signal among many, and relevant, helpful content still matters more. Do not expect speed work alone to move you from page three to page one. The more reliable benefit is simpler: faster pages keep more visitors, and more visitors means more enquiries.
How to test your site for free
01
PageSpeed Insights
Go to pagespeed.web.dev, paste your address and choose the mobile result. If your site has enough visitors, it shows real-visitor data at the top, which is the figure that counts. The lab score further down is a simulation, useful for finding problems but not the final verdict.
02
Google Search Console
The Core Web Vitals report groups your pages into good, needs improvement and poor using real visits.
03
Your own phone
Turn off Wi-Fi, open your site on mobile data, and time how long until you can read the headline and tap a button.
Test your most important pages, not only the homepage: your main service page, your contact page and any page you send ads to.
The fixes that usually matter most
1. Shrink your images
Large photos straight from a phone or camera are the most common cause of slow pages. Resize them to the size they are actually shown, compress them, and use a modern format such as WebP. This often improves LCP more than anything else.
2. Choose hosting that responds quickly
If the server takes two seconds just to start answering, a good LCP becomes nearly impossible. Slow responses can come from crowded cheap hosting, a database problem, or background tasks piling up. If your site is slow even when it has few images, ask your host to look at response time and resource limits.
3. Use caching and keep plugins lean
A caching plugin or server cache lets repeat requests load much faster. At the same time, every extra plugin adds code that loads on your pages. Remove what you do not use, and avoid plugins that load heavy files on pages that never need them.
4. Be careful with sliders, popups and third-party scripts
Large image sliders, auto-playing videos, chat widgets, ad scripts and tracking codes all compete for the phone’s attention. A cookie banner or popup that appears a couple of seconds after the page loads can push content down and hurt your layout score. Keep only the scripts you really use.
5. Reserve space for images and banners
If the page jumps because an image or banner loads late and shoves the text around, that is layout shift. Give images and embeds a fixed width and height so the browser holds their place while they load.
⏱️ A simple 30-minute plan
☐ Test your homepage and one service page on PageSpeed Insights (mobile)
☐ Write down the LCP, INP and CLS values and which ones fall short
☐ Compress the three largest images on those pages
☐ Remove one plugin or script you do not need
☐ Test again and compare. Repeat monthly.
STILL SLOW AFTER THE BASICS?
Let Us Take a Look
If your numbers are poor after basic fixes, the cause is usually deeper: the theme, the hosting or how the site was built. Our free audit checks your speed, mobile layout and search visibility. If you are not sure whether to fix or rebuild, read our guide to the signs it is time for a website redesign.
Sources: Google Search Central and web.dev (Core Web Vitals thresholds and INP replacing FID in March 2024); DataReportal, Digital 2027: Kenya (mobile connections, October 2026).
