Why your website's speed is costing you customers (and how to fix it)

Speed is the least glamorous thing about a website and one of the most commercially important. Visitors abandon slow pages, Google demotes them, and every second of delay measurably cuts conversions. Here's what actually matters.

What "slow" costs you

• Roughly half of mobile visitors abandon pages taking over 3 seconds
• Google uses page experience signals — including loading performance — in ranking
• Amazon-scale studies famously put the cost of 100ms of delay at ~1% of revenue; the effect exists at small scale too, just less measured

The three numbers worth knowing

Google measures speed through Core Web Vitals. In plain English:

• LCP (Largest Contentful Paint) — how long until the main content is visible. Target: under 2.5 seconds.
• CLS (Cumulative Layout Shift) — does the page jump around as it loads? Target: under 0.1.
• INP (Interaction to Next Paint) — does the page respond quickly when tapped? Target: under 200ms.

What actually makes small business sites slow

1. Images. The number one cause, by miles. A 4MB photo straight off a phone, displayed at 400px wide, is pure waste. Images should be resized to their display size and served in modern formats (WebP/AVIF). This alone often halves load times.

2. Theme and plugin bloat. Off-the-shelf themes load code for every feature they support, whether you use it or not — sliders, animations, icon packs, three JavaScript libraries doing the same job. Page builders stack more on top. Custom-built sites are fast partly because they only ship what they use.

3. Cheap hosting. £3/month shared hosting means sharing a server with hundreds of other sites. Time-to-first-byte suffers, especially under any load. Static hosting on a CDN — where your pages are pre-built and served from a location near the visitor — is both faster and often cheaper.

4. Third-party scripts. Chat widgets, tracking pixels, font services, embedded maps. Each one is someone else's server between your visitor and your content. Keep the ones that earn their cost; cut the rest.

How to test properly

Use Google's PageSpeed Insights (free) and test the mobile result — that's where your customers are and where the scores are harshest. Test your homepage and your most important service page. Anything above ~85 on performance is good for a business site; below 60 means you're losing people.

The fix priority order

• Compress and resize every image (biggest win, least effort)
• Remove plugins/widgets you don't use
• Move to proper hosting or a static/CDN setup
• Lazy-load images below the fold
• If on a heavy theme: consider whether a rebuild costs less than the customers the theme loses

Speed isn't a technical vanity metric — it's the ramp every visitor walks up before they ever read a word you wrote. Make it short.