Platform-Specific Questions
How does optimization for mobile devices differ?
Answer
Mobile optimization requires special attention because Google uses the Mobile-First Index and mobile devices typically have slower processors and less stable network connections than desktop PCs. Specifically, this means: JavaScript bundles must be kept minimal because parsing time on mobile devices is two to five times longer than on desktop. Images must be served in responsive sizes so smartphones do not download desktop-sized images. Touch interactions must respond without delay to achieve good INP values. And the layout must load without shifts to keep CLS values low.