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Web Performance

7 free browser-based tools

Lighthouse, bundle, source map, cache, web vitals and image weight analysis

All Web Performance

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Read Lighthouse report JSON and summarize scores, audits and Core Web Vitals findings.

Inspect webpack stats JSON for large assets, chunks and module size hotspots.

Inspect source map JSON for source counts, embedded source content and rough weight signals.

Classify LCP, INP, CLS, FCP and TTFB values against current Core Web Vitals thresholds.

Analyze Cache-Control, ETag and Vary headers for browser and CDN caching behavior.

Build a best-effort critical request chain summary from HAR entries and initiators.

Analyze image URL/file manifests for total weight, largest assets and compression opportunities.