This is especially important on pages where the user nes to do something, because that’s when the page becomes interactive. For a good user eperience, the FID time should not ece milliseconds . Core W Vitals source sw.devfid FID only focuses on input events from discrete actions like clicks, taps, and keystrokes. Interactions such as scrolling and zooming are continuous actions and have completely different performance constraints plus, browsers are often able to hide their lag by running them in a separate thread. Not all users will interact with your site every time they visit.

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This means that some users will have no FID values, some users will have low FID values, and some users will likely have high FID values. If you Colombia Mobile Number List want to improve your FID score ruce the impact of code host in other domains, minimize the work of the main thread, ruce JavaScript eecution time, keep the number of requests low and the transfer size small. More information about the FID improvement can be found at sw.devoptimize-fid Cumulative Layout Shift CLS Another metric measures visual stability. This is the amount of page layout shift during the loading phase.

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The result is scor on a scale of – , where zero is no shift and is the greatest shift. This is important because moving elements on the page while the user is trying to interact with it negatively affects their eperience. To ensure a good user USB Directory eperience, pages should maintain a CLS of no more than . . Core W Vitals source sw.devcls Unepect content offsets may be caus by an image or video with unknown dimensions, a font that renders larger or smaller than its default value, or a third- party ad or widget that dynamically resizes itself. Core W Vitals source sw devcls Changing the layout is bad when the user doesn’t epect it.