Web Performance Optimization Guide: Lighthouse Metrics and Vue‑Specific Techniques

Performance optimization is a hot topic in frontend development, and Lighthouse has become the de‑facto standard for measuring page speed, providing metrics such as First Contentful Paint (FCP), Time to Interactive (TTI), Speed Index, Total Blocking Time, Largest Contentful Paint (LCP) and Cumulative Layout Shift (CLS).

The article lists these Lighthouse metrics and explains why LCP, FCP and Speed Index are especially important because they heavily influence TTI, TBT and CLS scores.

General optimization techniques are presented: remove unused JavaScript, move render‑blocking resources, compress images, limit font usage, optimize the critical rendering path, and load non‑essential resources after the page is rendered. JavaScript can be loaded asynchronously using defer or async , and large bundles can be split with Vue‑CLI’s splitChunks configuration. Server‑side measures such as enabling gzip , using a cdn , and configuring cloud servers are also recommended.

For Vue projects, specific tips include using vue‑lazyload for image lazy‑loading, employing virtual scrolling plugins like vue‑virtual‑scroller or vue‑virtual‑scroll‑list , and writing functional components to avoid component initialization overhead. The article also suggests leveraging v‑show and keep‑alive to reuse DOM, and batch‑rendering components with requestIdleCallback to improve Speed Index.

To locate performance bottlenecks in bundled code, the author recommends generating a bundle analysis report with Vue‑CLI: <code>"report": "vue-cli-service build --report"</code> and using Chrome DevTools’ coverage feature to identify unused JavaScript or CSS.

In conclusion, the author emphasizes that performance optimization should be balanced with maintainability, encouraging developers to apply these techniques pragmatically rather than chasing scores for their own sake.