---
title: "Web Performance Guides"
description: "Improve loading speed, Core Web Vitals, and real-user experience across every important page."
canonical_url: https://optimi.com/en/guides/tags/web-performance
md_url: https://optimi.com/en/guides/tags/web-performance.md
---

# Web Performance Guides

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

- [Cache-Control Guide](/en/guides/cache-control.md): 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](/en/guides/rum-vs-synthetic-monitoring.md): 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](/en/guides/web-performance-budgets.md): 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](/en/guides/cdn-cache-misses.md): 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](/en/guides/cache-warming.md): 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](/en/guides/core-web-vitals.md): 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](/en/guides/speed-up-slow-website.md): 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](/en/guides/dns-performance.md): Understand DNS lookup latency, recursive caching, authoritative DNS, Anycast, TTLs, DNSSEC, measurement, migration, and rollback for faster websites.

- [Peak Traffic Readiness](/en/guides/peak-traffic-readiness.md): A practical peak-traffic readiness checklist covering capacity, caching, security, load testing, observability, and incident response.

- [Ecommerce Image Optimization](/en/guides/ecommerce-image-optimization.md): A practical ecommerce image optimization guide covering AVIF, WebP, responsive sizing, LCP, layout stability, CDN delivery, and verification.

- [Reduce TTFB](/en/guides/reduce-ttfb.md): 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](/en/guides/http-status-codes-seo.md): A practical guide to 2xx, 3xx, 4xx, and 5xx responses: how status codes affect crawling, indexing, redirects, caching, and web performance.

- [Technical SEO Infrastructure](/en/guides/technical-seo-fast-websites.md): A technical SEO checklist for edge infrastructure: DNS, HTTPS, redirects, caching, response time, Core Web Vitals, crawlability, and validation.

- [Website Speed and Search Visibility](/en/guides/website-speed-search-visibility.md): 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](/en/guides/media-edge-architecture.md): 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](/en/guides/video-streaming-at-the-edge.md): 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](/en/guides/http3-quic-production-websites.md): 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](/en/guides/distributed-systems-latency-budgets.md): 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.