Website speed: why it matters and how to check it
Published: 5 min read
Half of mobile visitors won’t wait more than 3 seconds. A slow site loses leads before the first screen — and ranks worse in Google.
How speed affects your business
- Visitors leave: the longer the load, the more people close the tab before seeing the offer.
- Ads cost more: you pay for the click, but the visitor didn’t wait for the page.
- Google uses speed (Core Web Vitals) in ranking, especially on mobile.
How to check speed in a minute
- Open PageSpeed Insights (pagespeed.web.dev).
- Paste the site address and press “Analyze”.
- Look at the “Mobile” tab — most visitors come from phones.
| Metric | What it means | Good |
|---|---|---|
| LCP | When the main content appeared | under 2.5 s |
| INP | How fast the site reacts to actions | under 200 ms |
| CLS | Whether the page “jumps” while loading | under 0.1 |
| Performance score | Overall speed score | 90–100 |
Why sites are slow
- Heavy images without compression, in old formats.
- Builders and themes with dozens of plugins and extra scripts.
- Widgets, chats and counters that load with the page.
- Cheap, slow hosting.
What makes a site fast
Modern image formats (WebP, AVIF) at the right size for each screen, minimal scripts, statically generated pages, loading heavy content only when needed, and good hosting with a CDN. These are built in during development — fixing them later always costs more.
FAQ
- What PageSpeed score is good?
- 90–100 is excellent, 50–89 needs improvement, below 50 the site noticeably loses visitors.
- Can an existing site be sped up?
- Often, yes: image compression, removing extra scripts and plugins, caching. But a site on a heavy builder is sometimes easier to rebuild than to speed up.