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First Input Delay
Definition: One of the three core web vitals, First Input Delay, seeks to answer the page's interactivity. As a non-page load metric, we understand how quickly the site responds to customer interactions.
Why it's good: FID lets us understand how quickly the site responds to users. Slow FID indicates user experience degradation.
What to consider: An often-ignored concept isn't to understand what the FID time is but more when the customers tend to provide the first input. With that, you will be able to understand the page dependencies that are created for customers to start interacting. Using our aggregate waterfalls, we can understand that moment.
