First Input Delay (FID) is the time from when a user first interacts with your page to when the page responds. It measures responsiveness and is one of the three Core Web Vitals metrics Google uses to measure page experience. Example interactions include: Clicking on a link or button. Inputting text into a blank field. Selecting a drop-down menu. Clicking a checkbox. Some events like scrolling or zooming are not counted. Let’s look at how fast your FID should be and how to improve it. What’s a good FID value? A good FID value is less than 100. What Is First ms and should be based on Chrome User Experience Report (CrUX) data.

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Actual users of Chrome who are on your site and have opted in to sharing this information. You need 75% of interactions to respond in less than 100 ms. The only FID company data number that matters comes from the Chrome User Experience Report (CrUX), which is data from real users of Chrome who choose to share their data. For consistent, repeatable tests, there’s also lab data, which tests with the same conditions. The breaks between tasks are the opportunities that the page has to switch to the user input task and respond to what they wanted to do.

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In lab tests because the testing tools don’t click anything. However, you can use Total Blocking Time (TBT) as an alternative metric. By improving the processes that Gulf Phone Number are blocked, you will also be improving your FID. JavaScript competing for the main thread. There’s just one main thread, and JavaScript competes to run tasks on it. JavaScript has to take turns to run on the main thread. It’s like a one-burner stove where you have to cook one item at a time, but you have multiple dishes to cook. While a task is running, a page can’t respond to user input. This is the delay that is felt. The longer the task, the longer the delay experienced by the user.