Time to Interactive (TTI)
Time to Interactive is a performance metric that measures the time it takes for a page to become fully and reliably responsive to user input. It marks the point where the page has displayed useful content (FCP) and the Main Thread is free of any Long Tasks that would prevent it from responding to an interaction quickly. While it was a key lab metric for many years, INP has now superseded it as the official Core Web Vital for measuring interactivity.
Related web performance terms
- Tag Manager
A tag manager (like Google Tag Manager) is a system that allows marketing and business teams to add and manage third-party marketing tags (snippets of code for analytics, advertising, etc.) on a we…
- Third-Party Script/Tool
A third-party script or tool is any piece of code, functionality, or service that is provided by an external vendor and integrated into a website.
- Throttling (CPU & Network)
Throttling is a technique used in Lab Data tools (like Lighthouse) to simulate how a website would perform on slower devices or less reliable network connections.
- Time To First Byte (TTFB)
A foundational web performance metric measuring the time from when a user makes a request to when their browser receives the very first byte of the HTML response.