The Ultimate Guide to Checking Mobile Friendliness in 2026

The Ultimate Guide to Checking Mobile Friendliness in 2026







PageSpeed Insights is an online tool that checks how well a page performs on both computer and mobile. For the mobile side of things, it runs Lighthouse tests and also uses real-world data from Chrome users. The tool finds problems in particular that slow down mobile loading for example pictures that aren’t compressed enough, JavaScript files that are too large or servers which take too long to respond. And then it gives you really clear advice on what to do: because a good performance score also means your site will be deemed ‘mobile-friendly’ by Google!










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