Guide topic

Web Performance

Improve loading speed, Core Web Vitals, and real-user experience across every important page.

Topic overview

Improve web performance with evidence, not one-off scores

Web performance is the experience a real visitor has from the first network request through loading, interaction, and visual stability. A Lighthouse result can help diagnose a page, but it cannot replace field data segmented by device, country, connection, template, and cache status.

Start with the user journeys that matter most, such as product discovery, account access, checkout, or publishing. Measure TTFB, LCP, INP, and CLS alongside cache-hit ratio, origin latency, response errors, and changes in release behavior. This makes the bottleneck visible before a team chooses a CDN rule, JavaScript change, image optimisation, or origin fix.

The guides below cover the delivery path end to end: performance budgets, Core Web Vitals, caching, monitoring, DNS, and safe migration. Use them to form a measurable baseline, make one controlled change at a time, and verify the result with real users.

Related guides

Web Performance guides

Cache-Control Guide

A practical Cache-Control guide with safe patterns for static assets, HTML, APIs, private data, shared CDNs, revalidation, and stale responses.

RUM vs Synthetic Monitoring

RUM and synthetic monitoring answer different performance questions. Learn when to use each, how to combine them, and how to turn signals into action.

Web Performance Budgets

A practical method for setting, enforcing, and reviewing web performance budgets across page weight, Core Web Vitals, third parties, and delivery paths.

CDN Cache Misses

Learn how to distinguish a real cache miss from a bypass or revalidation, find the root cause, and improve CDN cache efficiency without caching private data.

Cache Warming Explained

Learn how cache warming reduces cold-cache latency, which URLs to warm, how to avoid stale or unsafe content, and what to measure at the edge.

Core Web Vitals Guide

Understand LCP, INP, and CLS, their current good thresholds, how to measure them in field and lab data, and which fixes to apply first.

Speed Up a Slow Website

A practical 2026 checklist for diagnosing and speeding up a slow website, from TTFB and Core Web Vitals to images, JavaScript, caching, and CDN delivery.

DNS Performance Guide

Understand DNS lookup latency, recursive caching, authoritative DNS, Anycast, TTLs, DNSSEC, measurement, migration, and rollback for faster websites.

Peak Traffic Readiness

A practical peak-traffic readiness checklist covering capacity, caching, security, load testing, observability, and incident response.

Ecommerce Image Optimization

A practical ecommerce image optimization guide covering AVIF, WebP, responsive sizing, LCP, layout stability, CDN delivery, and verification.

Reduce TTFB

Learn what TTFB measures, how to isolate DNS, network, CDN, application, and database delays, and which changes reliably reduce server response time.

HTTP Status Codes and SEO

A practical guide to 2xx, 3xx, 4xx, and 5xx responses: how status codes affect crawling, indexing, redirects, caching, and web performance.

Technical SEO Infrastructure

A technical SEO checklist for edge infrastructure: DNS, HTTPS, redirects, caching, response time, Core Web Vitals, crawlability, and validation.

Website Speed and Search Visibility

A practical guide to the relationship between website speed, Core Web Vitals, crawling, and search visibility without overstating what performance can do.

Media Edge Architecture

Design a publisher edge for breaking-news spikes, public caching, paywalls, ad-tech resilience, image delivery, crawler access, and origin protection.

Video Streaming at the Edge

A practical guide to HLS and DASH manifests, segment caching, range requests, origin shielding, ABR, entitlement boundaries, QoE observability, and safe rollouts.

HTTP/3 and QUIC

Deploy HTTP/3 and QUIC safely with UDP fallback, TLS 1.3, 0-RTT replay controls, proxy considerations, protocol observability, and production validation.

Distributed Systems Latency Budgets

Learn how to design, measure, and enforce distributed systems latency budgets, from user journeys and edge caches to services, queues, databases, circuit breakers, and origin protection.