Performance & Compatibility Assessment
An application that loads slowly or breaks in one browser loses users regardless of how good its features are. Browser DevTools let you find real bottlenecks — network waterfall, render-blocking assets, slow JavaScript — instead of guessing. Cross-browser and cross-device testing surfaces compatibility problems (layout, CSS, JS behaviour) before they reach production, and connecting both back to Core Web Vitals keeps the discussion grounded in measurable numbers rather than vague impressions.
Starting Points
- Google. Web Vitals — Overview and metrics. web.dev.
- Chrome Developers. Performance panel: Analyze your website's performance.
- MDN Web Docs. Strategies for carrying out testing (cross-browser and device testing).
Key Points
- You identify key performance issues using DevTools (large assets, blocking scripts, excessive requests) during a page-load profile.
- You implement at least one concrete optimisation (e.g. image compression, bundling/minification, lazy loading, caching headers) and show a measurable improvement in load time or a Core Web Vitals metric.
- You test the application in at least two modern browsers and multiple viewport sizes, and report compatibility issues with proposed fixes.
- You explain in plain language how performance and compatibility affect user experience and business impact (drop-off, conversions).