Always include width and height

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You can follow some steps to speed up this loading: optimize and compress images; preload important resources; compress text files; deliver different assets based on network connection (adaptive service); enable caching with a service worker. Breaks heavy Javascript into smaller asynchronous tasks While the browser executes JavaScript, it cannot respond to user interactions. Therefore, heavy scripts can delay the response of the website , i.e. the First Input Delay (FID). To solve this problem, split long JavaScript tasks into smaller asynchronous tasks.


These long tasks block the main activity for 50 milliseconds or more and Phone Number List are a sign that JavaScript is working longer than the user currently needs. Therefore, breaking it down into smaller tasks tends to reduce page input lag. Use a web worker A web worker allows JavaScript, which delays responding to users, to run in the background . Non- UI operations are moved to a worker thread, while the browser can perform the tasks that the user requested. In this way, it is possible to improve the FID. Use a font loading API Loading web fonts can also delay loading and cause sudden layout changes that disrupt the experience.





While they are not loading, the browser may use an invisible font (Flash of Invisible Text or FOIT) or a generic font (Flash of Unstyled Text or FOUT), which can misconfigure the layout. Then, when the original source is loaded, the layout suddenly changes. To prevent this from happening, you can use a font loading API, which ensures that your text fonts are preloaded . Includes width and height attributes for images and videos Always include width and height size attributes on images and videos. The absence of this setting is one of the main reasons for poor performance in CLS, as these elements can take time to load and cause sudden layout changes. On the other hand, when you define the width and height measurements, the browser already knows the correct space it needs to allocate to that specific content.