Website speed on mobile networks: what actually matters for local customers

Why speed matters

A visitor who taps a link on a phone decides quickly whether to wait. On a variable mobile connection, heavy pages feel slower and many visitors leave before they see your phone number. Speed also influences how search engines treat your site, so a fast page helps in two ways.

The targets to aim for

Google publishes three Core Web Vitals and the thresholds it considers good:

Practical fixes

Images

• Resize images to the size they are shown. A phone does not need a very large photo.
• Use modern formats such as WebP or AVIF.
• Load images below the first screen lazily, and give every image a width and height so the page does not jump.

Fonts

• Use one or two font families and only the weights you need.
• Host fonts on your own domain and preload the main ones to avoid waiting on another server.
• Make sure text shows immediately with a fallback font while custom fonts load.

Scripts and plugins

• Remove plugins and tracking scripts you do not use.
• Load chat widgets and maps only when needed.
• Keep your own scripts small and avoid heavy libraries for simple tasks.

Hosting and caching

• Serve pages from a content delivery network so they travel a shorter distance.
• Cache static files for a long time and version them when they change.
• Enable compression, and keep HTTPS on.

How to test

Run your address through Google’s PageSpeed Insights and check the mobile result first. Then test on a real mid-range phone over mobile data, not only on fast office Wi-Fi. If you use WordPress, a clean theme and fewer plugins usually help more than any single optimisation trick. Our on-page and technical SEO and WordPress development services start with this kind of audit.

Design for slow networks

• Put your business name, what you do, your town and a call or WhatsApp button on the first screen.
• Keep forms short. Ask for a name and a phone number first.
• Make buttons large enough to tap with a thumb.
• Test the page with images off, to see whether the message still works.

For help deciding what your site needs, see the small business website checklist.