Website Speed and Mobile: Why It All Matters for Trades

Most articles about website speed are written for developers. Lots of acronyms, lots of charts, very little about why a busy plumber should care.

This isn't that. This is what page speed and mobile performance actually mean for a UK trades business, why Google now ranks the mobile version of your site first, and the five things you can check on your own site this afternoon.

I ran a cleaning business in Lancashire for eleven years. Customers ringing for an end-of-tenancy clean were almost always panicking on a phone two days before the move. If the website had taken five seconds to load, they'd have rung the next cleaner on the list. Speed isn't a vanity metric. It's whether the phone rings.

What "page speed" actually means

How long it takes for your website to become useful. Under 1.5 seconds: excellent. 1.5–2.5: good. 2.5–4: middling, losing visitors. Over 4 seconds: poor — over half your mobile visitors leave before the page finishes loading. That's from Google's own research. A 3-second load loses 32% of visitors. A 5-second load loses 90%.

A real example: 6 seconds vs 1.8 seconds

A woman in her kitchen, damp patch spreading on the ceiling, googles "builder [her town]". Builder A takes 6 seconds — blank screen, header appears at second 3, text at second 5, phone number nowhere. She backs out at second 4. Builder B loads in 1.8 seconds: business name, three services, photo, phone number big enough to tap with one thumb. She taps, phone dials. Builder B wins a £6,000 damp-proofing job. The entire difference: 4.2 seconds.

Why mobile is now the version Google ranks

Google switched to mobile-first indexing. That means when Google decides your rank, it looks at the mobile version of your site, not the desktop version. If your mobile site is a mess but desktop is brilliant, Google ranks you based on the mess. Sites built 2015–2018 often had a separate cut-down mobile version. Now that afterthought is what Google judges you on.

Core Web Vitals explained in plain English

LCP — Largest Contentful Paint

How long the biggest visible thing takes to load. Usually your hero image. Good: under 2.5 seconds. Poor: over 4.

CLS — Cumulative Layout Shift

How much stuff jumps around while loading. You go to tap a button, an ad loads above it, pushes it down, you tap the ad by accident. That's CLS. Good: under 0.1. Usually fails because images don't have proper dimensions set in code.

INP — Interaction to Next Paint

How quickly the page responds when you tap. Good: under 200ms. Usually fine unless your site is overloaded with tracking scripts, chat widgets, and analytics from six providers.

Check your scores: Google's free PageSpeed Insights tool. Paste your URL in. Aim for green on every metric.

Image sizes: how a 5MB photo is killing your rankings

Modern phone cameras take 4–6MB photos. Upload twenty straight from your phone and the page weighs 60–80MB. On 4G that's 15–25 seconds to load. A properly handled image is sized correctly, compressed to under 200KB, in WebP or AVIF format (30% smaller than JPEG), and lazy loaded (only loads when you scroll near it). If your designer doesn't know what WebP or lazy loading is, find a different designer.

Why cheap shared hosting can't compete

£3/month hosting puts hundreds of sites on one server. WordPress with page builders generates huge amounts of code. A typical WordPress site on cheap hosting loads in 4–7 seconds. A static Astro site on a global CDN: 0.8–1.8 seconds. Same content. Same design. Four times faster.

What Fehu does differently

Every Fehu site is static, on a global CDN. Images auto-convert to WebP, sized for the device, lazy loaded. Total page weight under 500KB — about a tenth of a typical WordPress site. Fehu scores 97 on Lighthouse Performance. Most agency trades sites score in the 40s and 50s.

Practical checklist: 5 things to check this afternoon

1. Time your homepage on a real phone — mobile data, not wifi. Over three seconds is a problem.
2. Run PageSpeed Insights — paste your URL. Under 70 means visitors are bouncing.
3. Check your biggest image size — save it, check file size. Over 500KB? Too big.
4. Test your phone number link — does it ring when tapped on mobile? If you have to copy-paste, you're losing customers.
5. Check for layout shift — reload on slow connection. Watch for jumping elements. That's CLS costing you visitors.

If your website fails on two or more of those checks, every day that goes by is enquiries quietly going to the next business in the search results. The fix isn't expensive. It's building it right in the first place, on the right platform, with the right tools, by someone who treats speed as a deliverable rather than an afterthought.