--- title: "What is Time to Interactive? 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Squarespace Speed Optimization ](/services/squarespace-speed-optimization) [Book a Call](/contact) [Home](/) [Resources](/resources) [Glossary](/resources/glossary) Time to Interactive Loading Performance · Glossary # Time to Interactive (TTI) ![Matt Suffoletto](/assets/matt-CEkmAuBN.jpg)Written by [Matt Suffoletto](/resources/author/matt-suffoletto) Published June 26, 2026 ![Time to Interactive](/__l5e/assets-v1/03588e55-ccc2-41a4-994b-9693abd37375/gloss-hero-time-to-interactive.png) Share [](https://twitter.com/intent/tweet?url=https%3A%2F%2Fwww.pagespeedmatters.com%2Fresources%2Fglossary%2Ftime-to-interactive&text=Time%20to%20Interactive)[](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fwww.pagespeedmatters.com%2Fresources%2Fglossary%2Ftime-to-interactive)[](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fwww.pagespeedmatters.com%2Fresources%2Fglossary%2Ftime-to-interactive)[](https://www.reddit.com/submit?url=https%3A%2F%2Fwww.pagespeedmatters.com%2Fresources%2Fglossary%2Ftime-to-interactive&title=Time%20to%20Interactive) On This Page - [TL;DR](#tldr "TL;DR") - [What is Time to Interactive](#definition "What is Time to Interactive") - [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%2Ftime-to-interactive&text=Time%20to%20Interactive)[](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fwww.pagespeedmatters.com%2Fresources%2Fglossary%2Ftime-to-interactive)[](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fwww.pagespeedmatters.com%2Fresources%2Fglossary%2Ftime-to-interactive)[](https://www.reddit.com/submit?url=https%3A%2F%2Fwww.pagespeedmatters.com%2Fresources%2Fglossary%2Ftime-to-interactive&title=Time%20to%20Interactive) 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 Time to Interactive (TTI) is a lab metric that records the time, in seconds, from page load start until the page is visually rendered, event handlers are registered, and the main thread is free of long tasks for at least five seconds. ## What is Time to Interactive (TTI)? Time to Interactive (TTI) is a lab metric that records the time, in seconds, from page load start until the page is visually rendered, event handlers are registered, and the main thread is free of long tasks for at least five seconds. Learn more in our [how TTI fits into a performance audit](/resources/guides/ultimate-measurement-tools-data-guide) guide, or work with us through our [done-for-you speed optimization service](/services/core-web-vitals-optimization). ## How TTI is Measured TTI is reported by Lighthouse from a performance trace. ## Related Terms [Glossary ### Total Blocking Time (TBT) ](/resources/glossary/total-blocking-time)[Glossary ### Interaction to Next Paint (INP) ](/resources/glossary/interaction-to-next-paint)[Glossary ### Long Tasks ](/resources/glossary/long-tasks) Sources - [web.dev: TTI](https://web.dev/articles/tti) [![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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