Performance Optimization for Web Apps: Lighthouse, A/B Testing
Performance Optimization for Web Apps: Lighthouse, A/B Testing Performance matters for user satisfaction, conversions, and search visibility. Lighthouse provides structured audits that show where a web app shines and where it slows down. In a single report you can see scores for Performance, Accessibility, Best Practices, and SEO. The most practical part is the Performance section, which focuses on how fast content becomes usable and stays smooth. Key metrics to watch are FCP, LCP, CLS, TBT, and TTI. FCP shows when the first piece of content appears; LCP tracks when the main content loads; CLS measures unexpected layout shifts; TBT is the total time spent blocking the main thread; TTI marks when the page becomes fully interactive. For best results, aim LCP under 2.5 seconds, CLS under 0.1, and keep blocking time low to improve TTI. ...