Why it matters
Most searches and website visits now happen on phones, and Google indexes and ranks the mobile version of your pages. A slow or awkward mobile page loses visitors before they read a word.
What to optimize
- Layout: use responsive design and the viewport meta tag, so pages fit any screen without zooming or sideways scrolling.
- Speed: compress and resize images, use modern formats such as WebP or AVIF, and cut unused JavaScript and CSS.
- Readability: a base font size of at least 16 pixels, short paragraphs and good contrast.
- Tap targets: buttons and links large enough, and far enough apart, to tap easily.
- Pop-ups: avoid full-screen pop-ups that cover the content.
- Forms: few fields, the right keyboard for each field, and autofill.
How to test
Use PageSpeed Insights for Core Web Vitals and Lighthouse checks, and test on real phones. Google Search Console shows Core Web Vitals for your whole site.