Keep page load time under 3 seconds

Studies show 53% of mobile users abandon sites that take longer than 3 seconds to load—slow pages directly hurt conversions, engagement, and SEO rankings.

Quick Reference

• 3 seconds is the threshold where bounce rates spike dramatically
• 53% of mobile users abandon sites taking over 3 seconds
• Focus on Core Web Vitals: LCP, FID/INP, CLS
• Test on throttled 3G to simulate real-world conditions

Check

Measure the page load time and verify it's under 3 seconds on a standard connection.

Fix

Optimize page load time through lazy loading, CDN usage, caching strategies, and resource optimization.

Explain

Explain how page load time affects bounce rate, SEO rankings, and user satisfaction.

Code Review

Review the routes, assets, and loading behavior that affect Keep page load time under 3 seconds. Flag exact files, requests, or rendering steps that add unnecessary network, CPU, or layout cost, and describe the measurement method used to confirm the issue.

For full implementation details, code examples, and framework-specific guidance, see references/rule.md.

Rule page: https://frontendchecklist.io/en/rules/performance/page-load-time