12/31/2023 0 Comments Input delay test![]() A delay is only recorded if they try to click somewhere on your page. Communicate to the user that the page isn't ready for interaction Īs a field metric, First Input Delay depends on the behavior of your users. Avoid loading too many third-party scripts and search for alternatives if a third-party is particularly slow. Third-party widgets can often load and execute large amounts of code, blocking the page main thread. Reduce the amount of JavaScript running on your page, for example by speeding up your application code, using faster JavaScript libraries, or by lazy-loading coded that isn't necessary right away. Reduce the download size and JavaScript execution time on your page to achieve this. You can prevent input delays by fully initializing your page before the user tries to interact with it. How to reduce First Input Delay Make your page finish loading quickly When a user tries to interact with a page while the CPU is blocked they'll experience a delay in how quickly the page responds to their input. If your TBT is 0ms then the your First Input Delay will be under 50ms, as long as your real users use a device with a similar performance to the lab tool. Lab-based tools like Lighthouse instead report a metric called Total Blocking Time (TBT).Ī CPU task counts as blocking time when it takes longer than 50ms to run. Relationship to Total Blocking Time įirst Input Delay can only be measured if the user interacts with a page, so it can only be measured in the field with real users. On a mobile device, Google says a First Input Delay under 100ms is good, up to 300ms needs improvement, and more than 300ms is poor. This also applies when clicking on a link or dropdown. A delay is captured if an event handler is delayed, or if an HTML element responds slowly for other reasons.įor example, clicking on a text input requires the page main thread to be idle, even if no custom JavaScript code runs in response to the click. User input includes clicks, taps, and key presses. The time spent running the event handler does not count towards FID, so if your CPU is idle the First Input Delay will always be 0ms.Ī First Input Delay is only measured if the user interacts with the page, otherwise no value is recorded. It measures how much time elapses between when the user first interacts with the page and when the CPU becomes idle, i.e., when the event handler for the user interaction starts running. What is First Input Delay įirst Input Delay happens when a user interacts with a page while the CPU is already busy doing other work on the page. The First Input Delay of your website is good if 75% of your mobile users experience input delays under 100ms. A page that responds quickly to user input provides a better user experience.įID is one of the Core Web Vitals that Google uses in its search rankings. First Input Delay (FID) measures how long it takes for the browser to start processing a user interaction, like a click or tap on the page.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |