How would you improve a page that loads quickly on desktop but poorly on a mobile connection?

Measure a representative device and network profile, inspect the waterfall, and identify what delays useful content and interaction. Reduce oversized images, unnecessary JavaScript, blocking resources, and excessive third-party work. Serve suitable image sizes, compress text assets, cache versioned static files, and defer work that is not needed immediately. Preserve dimensions to avoid layout shifts. Confirm the improvement with both controlled measurements and real-user data where available. Optimizing a single score without checking usability can move work around while leaving the user’s experience poor.