--- title: "What is Browser Caching? 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Squarespace Speed Optimization ](/services/squarespace-speed-optimization) [Book a Call](/contact) [Home](/) [Resources](/resources) [Glossary](/resources/glossary) Browser Caching Optimization Techniques · Glossary # Browser Caching ![Matt Suffoletto](/assets/matt-CEkmAuBN.jpg)Written by [Matt Suffoletto](/resources/author/matt-suffoletto) Published June 26, 2026 ![Browser Caching](/__l5e/assets-v1/abc494ef-b715-497e-b965-dc5b0c128235/gloss-hero-caching.png) Share [](https://twitter.com/intent/tweet?url=https%3A%2F%2Fwww.pagespeedmatters.com%2Fresources%2Fglossary%2Fcaching&text=Browser%20Caching)[](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fwww.pagespeedmatters.com%2Fresources%2Fglossary%2Fcaching)[](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fwww.pagespeedmatters.com%2Fresources%2Fglossary%2Fcaching)[](https://www.reddit.com/submit?url=https%3A%2F%2Fwww.pagespeedmatters.com%2Fresources%2Fglossary%2Fcaching&title=Browser%20Caching) On This Page - [TL;DR](#tldr "TL;DR") - [What is Browser Caching](#definition "What is Browser Caching") - [How It's Measured](#how-measured "How It's Measured") Share this guide [](https://twitter.com/intent/tweet?url=https%3A%2F%2Fwww.pagespeedmatters.com%2Fresources%2Fglossary%2Fcaching&text=Browser%20Caching)[](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fwww.pagespeedmatters.com%2Fresources%2Fglossary%2Fcaching)[](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fwww.pagespeedmatters.com%2Fresources%2Fglossary%2Fcaching)[](https://www.reddit.com/submit?url=https%3A%2F%2Fwww.pagespeedmatters.com%2Fresources%2Fglossary%2Fcaching&title=Browser%20Caching) Speed Audit ### Find out what's slowing your website down Enter your URL and our team will send back a free, no-strings performance analysis within 24 hours. Get my audit 100% free Results in 24h ## TL;DR Browser caching is the storage of HTTP responses on the client so that repeat requests for the same resource can be served locally, controlled by response headers such as Cache-Control, ETag, and Last-Modified. ## What is Browser Caching? Browser caching is the storage of HTTP responses on the client so that repeat requests for the same resource can be served locally, controlled by response headers such as Cache-Control, ETag, and Last-Modified. Learn more in our [improving your cache policy](/resources/guides/web-performance-optimization-complete-guide) guide, or work with us through our [done-for-you speed optimization service](/services). ## How Browser Caching is Measured Cache headers are inspectable in the Network panel of Chrome DevTools, and Lighthouse audits 'Uses efficient cache policy on static assets'. ## Related Terms [Glossary ### Content Delivery Network (CDN) ](/resources/glossary/cdn)[Glossary ### Compression (Brotli / Gzip) ](/resources/glossary/compression)[Glossary ### Time to First Byte (TTFB) ](/resources/glossary/time-to-first-byte) Sources - [web.dev: HTTP caching](https://web.dev/articles/http-cache) [![PageSpeed Matters](/assets/logo-DtyG_mQE.png)](/) We optimize website load times to rank higher, decrease advertising costs, and convert more often. 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