Definition
Time to Interactive (TTI) is a lab metric that measures the time from when a webpage starts loading to when its main sub-resources have loaded and it is capable of reliably responding to user input quickly. It identifies cases where a page appears interactive but isn’t, ensuring a page is usable.
User Cases
In real-world scenarios, TTI helps developers understand when a webpage is fully interactive. This is crucial for ensuring users can interact with elements like buttons and links without delay. For instance, a page might visually load quickly, but if TTI is slow, users may experience frustration as they cannot interact with the page immediately.
Why It Matters for SEO
TTI is important for SEO because it affects user experience, a critical factor in search engine rankings. A fast TTI ensures users can interact with a page promptly, reducing bounce rates and increasing user engagement, both of which are favorable for SEO. Although TTI has been removed from Lighthouse 10, understanding and optimizing for interactivity remains vital for maintaining a competitive edge in search rankings.
Related Concepts
Related concepts include Largest Contentful Paint (LCP), Total Blocking Time (TBT), and Interaction to Next Paint (INP). These metrics also focus on page load performance and user interaction, offering alternative ways to measure and optimize a webpage’s responsiveness and usability.