What metrics indicate a successful mobile-friendly design?

A successful mobile-friendly design produces measurable improvements across several interconnected metrics. Mobile bounce rate should decrease relative to baseline, indicating that users are engaging with the content rather than immediately leaving. Mobile session duration and pages per session should increase, reflecting improved usability and content discoverability.

Core Web Vitals scores for mobile, visible in Google Search Console, should meet the ‘Good’ threshold: LCP under 2.5 seconds, FID under 100 milliseconds, and CLS below 0.1. Mobile conversion rate, compared to desktop, is a particularly revealing metric. A significant gap between mobile and desktop conversion rates is a reliable indicator of mobile UX deficiencies that design improvements have not yet resolved.

IKF Insight

Track mobile vs desktop performance gap to identify hidden UX issues.

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