Start with real measurements
Use PageSpeed Insights and field data where available. Review Largest Contentful Paint, Interaction to Next Paint and Cumulative Layout Shift on representative mobile pages.
Reduce what the browser must download
Compress and correctly size images, use modern formats, remove unused CSS and JavaScript, and avoid large third-party scripts unless they have a clear purpose.
Keep layout stable
Reserve image dimensions, avoid injecting content above existing content and use a system font stack when custom fonts are not essential.
Measure after each release
Compare the same URLs and device profiles before and after changes. Do not claim a performance improvement without repeatable measurements.
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