Performance References

User-facing performance is a budget problem. These references cover the metrics, the formats, and the patterns that move the needle.

4 references Vendor-neutral

Metrics & Loading

CWV

Core Web Vitals

LCP, INP, and CLS — what they measure, the targets, and how to debug them.

 LZ

Lazy Loading

Native loading="lazy", intersection observers, and what NOT to lazy-load.

Assets & Compression

IMG

WebP and AVIF Formats

Modern image formats — when to ship them and how to fall back gracefully.

 GZ

Compression Formats

gzip, Brotli, and Zstandard at the HTTP layer — what to enable and where.

Related tools and references

HTTP Headers Reference // web-development HTTP/2 // protocols HTTP/3 and QUIC // protocols CDN Basics // networking Text Counter // tools

External authority sources