GLOSSARY TERM
What is TTI (Time to Interactive)?
Definition
The point at which the page is fully rendered AND can reliably respond to user input within 50ms. Captures both visual completion and JavaScript responsiveness.
Why it Matters for AI Search
TTI is a more honest measure of "feels usable" than FCP or LCP alone. A page can hit a great LCP but be unresponsive for another five seconds while React hydrates. TTI catches that gap.
Related Terms
FCP (First Contentful Paint)FID (First Input Delay)Speed IndexInteraction to Next Paint (INP)Lazy LoadingURL Inspection Tool
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