Suggest an editImprove this articleRefine the answer for “What is time-to-interactive (TTI)?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)**Time to Interactive (TTI)** is a metric that shows how many milliseconds after the page loads the user can start fully interacting with it (clicking buttons, entering text, and so on), with the site responding quickly. **Key point:** TTI is not about when the site looks ready, it's about when it actually starts working.Shown above the full answer for quick recall.Answer (EN)Image**Time to Interactive (TTI)** is a metric that shows how many milliseconds after the page loads the user can start fully interacting with it (clicking buttons, entering text, and so on), with the site responding quickly. --- ## What counts as interactivity - interface elements are already painted - JavaScript has finished running heavy tasks - there are no long blocking processes on the main thread - the site responds to clicks and input without noticeable delay --- ## Example The page loaded visually in 1.5 seconds, but scripts block interaction for another 3 seconds. In that case, TTI would be about 4.5 seconds. The user sees the page but cannot do anything with it, which is bad UX. --- ## Why this matters - TTI affects how "alive" the site feels - a long TTI causes frustration: "the site is there, but nothing works" - TTI is factored into Google Lighthouse and affects SEO through Core Web Vitals --- ## Conclusion TTI is not about "when the site looks ready", it's about "when it actually starts working".For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.