First Input Delay (FID)

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This metric measures the response time to the first user interaction with the page, such as a JavaScript control or a click. FID stands for “first input delay,” which is the time it takes for the website to process a response to an interaction, which occurs in milliseconds. Input latency or delay can be caused by other processes, such as a large JavaScript file being loaded in parallel.

According to Google, the impression a user will have estonia mobile database the page is also determined by the response time, and not only by the content loading time. Therefore, it is essential that the FID and LCP evaluation are combined.

Furthermore, for the user to have a quick response and not abandon the page, this time should not exceed 100 milliseconds. If the time is between 100ms and 300ms, it means that the site needs adjustments for SEO . If it is above 300ms, users are having an experience.

Cumulative Layout Shift (CLS)
This metric measures the severity and frequency with which unexpected layout shifts occur on a page. Therefore, we can translate CLS as “cumulative layout shift”.

Whenever an element on a website changes position while the user interacts with it, these unexpected changes occur. This happens when the user clicks on a button, for example, and the element loads, causing the position of the button to change and the user ends up clicking where they didn't want to. This usually causes a lot of dissatisfaction among those who visit the website.

This problem often occurs due to asynchronous loading between elements or when some dynamic configuration needs to be adapted to the context. Thus, heavier elements such as automatically resized ads or images without defined sizes can cause sudden moments that negatively affect the page experience.

It is important that the CLS score of websites is below 0.1, as recommended by Google. If the value is between 0.1 and 0.25, it means that the page needs adjustments. If the value exceeds 0.25, it means that sudden changes to the website are causing a poor user experience.