Speed and usability on a mobile-friendly website

A mobile-friendly website should let visitors read content, navigate menus and complete their intended task on a phone. Fitting the design onto the screen is only the beginning. A slow-loading cover, a button that keeps moving or a form that erases answers after an error can make a good-looking page difficult to use.

Start with a real task

Instead of opening the site on a phone and only looking at the home page, try a customer scenario. Find a service, read its scope, complete the contact form and see the submission result. Note where you hesitate, which information you cannot find and which touch targets are difficult to use.

Do not limit testing to shrinking the screen on a powerful computer. Try different phones and slower connections. Check menus, expandable areas, form layout when the keyboard opens and how fixed contact buttons relate to the content.

Understand what speed measurements tell you

Core Web Vitals includes three key measurements of loading, interaction and visual stability. LCP assesses when the main content appears, INP measures responses to interactions and CLS assesses unexpected layout shifts. The thresholds used for a good experience are 2.5 seconds, 200 milliseconds and 0.1 respectively, evaluated at the 75th percentile of visits. Google’s explanation of Core Web Vitals describes their relationship with the search experience.

A single test does not represent every visitor’s experience. Laboratory tests help identify issues, while real user data shows actual usage conditions. New or low-traffic sites may lack sufficient field data. In that case, treat test results as a useful starting point.

Prioritise images and additional code

Serve the large image on the first screen at the size needed. Sending every phone a heavy desktop file creates unnecessary load. Defining image dimensions helps reduce movement in surrounding content during loading.

Review added chat tools, tracking code and animations too. Ask what each contributes to the user or business. Measure their impact before deciding, rather than removing all additions together. Aim for a lighter page that preserves its function.

Adapt forms for mobile use

Request only the fields genuinely needed for an initial conversation. Keep field descriptions visible and make error messages explain how to fix the issue. Use the appropriate keyboard for phone and email fields. Provide feedback during submission and preserve the user’s answers if it fails.

For example, rather than expecting a long project specification from someone seeking a corporate quote at the first step, collect their basic need and contact details. More detailed information can follow in the next conversation.

Verify improvements with the same scenario

Repeat the original task after making changes. Can the form be completed, is the menu comfortable to use and have performance measurements improved? Assess the results together: a high performance score alone does not guarantee search rankings or more enquiries. You can plan your web and mobile solutions with Tigur around the tasks visitors want to complete.