Time to Interactive

Definition: Time to Interactive (TTI) looks to quantify the page's interactivity by ensuring that long tasks have stopped. This gives us the guaranteed understanding that the page is fully interactive.

Why it's good: TTI is a good measure to understand that long-running functions are not causing issues for your customers. By reducing the long-running functions on the page, we can improve interactivity.

What to consider: According to the design of Time to Interactive from Google, there must be a five-second quiet window where a long task does not occur. As a result, only customers that have waited on a page for that window will have a reported TTI. Any quick-clicking customers will not have a TTI. Additionally, TTI will not be reported for customers with extremely long functions that get frustrated and leave because the functions never stop before the customer has left. TTI leaves these two blind spots.