Delivering a speedy experience to visitors is critical to your site’s success. However, there are multiple ways to gauge how well it does that. One of them is First Input Delay (FID), which measures the amount of time in milliseconds (ms) between when a user first interacts with your site and when their browser responds to that action.
In this post, we’ll explain what FID is and how to measure it. We’ll also discuss what a good FID score is, and walk you through how you can optimize yours. Finally, we’ll wrap up with some frequently asked questions. Let’s get started!