Mobile
Why your website feels slow on a phone
Slow mobile pages cost enquiries, but speed problems have different causes. What to check on your UK business site before you assume you need a rebuild.
When a page feels slow on a phone, owners often hear “you need a new website.” Sometimes that is true. More often the cause is one or two fixable issues — oversized images, an extra script, or a layout that fights small screens.
Speed matters because mobile visitors decide quickly. If your menu lags, your images crawl in, or your contact button sits below three screens of promotion, people leave before they enquire.
Key takeaways
- Test on mobile data, not only on shop Wi-Fi.
- Huge images are the usual cause, not the whole website.
- Anything covering the contact button costs you the enquiry.
- Fix the page that earns the money before you talk about a rebuild.
1. Distinguish “slow network” from “slow site”
A page that is merely large will feel different on Wi‑Fi versus mobile data. You need both views before blaming your platform.
2. Look at images before you look at code
Uncompressed hero photos are the most common cause of slow first loads on local business sites. A single 4 MB banner can dominate a page budget.
3. Notice layout shift and blocked buttons
Cumulative layout shift — text jumping when a banner appears — feels like “broken” even when the score looks acceptable. Pop-ups and sticky bars that cover your phone number create the same frustration.
4. Run a structured check, not a guess
Browser tools help, but most owners are not running Lighthouse every week. A structured check against a real URL gives you numbers and plain-language priorities.
5. Decide whether you need care or a project
Ongoing small improvements suit monthly website care. A platform migration, new theme or deep performance rebuild is a separate project with its own quote.
Frequently asked questions
Does a low speed score always mean I need a new website?
No. Many scores improve with image optimisation, fewer scripts and template tweaks on the same platform.
Can you care for a site you did not build?
Yes, subject to review and access. Your site stays in your account.
How often should I re-check mobile performance?
After any redesign, plugin update, or seasonal campaign — at least quarterly for busy trading sites.
Try the checker
Run a free website check on your address to see mobile scores and suggested fixes in a few minutes.