The Largest Contentful Paint (LCP) is the main factor in measuring load times. This has to do with how fast a website loads for a user. Despite this being a User Focused metric, these LCP load times don’t always correlate with the users load speed but rather the load speeds that Google identifies. When it comes to LCP though, the fundamental items still hold true – keep coding, imagery and more light.
The First Input Delay (FID) is based on how quickly your website becomes interactive. FID looks at delivery of certain functionality, which is most often brought down by 3rd party integrations. 3rd party web integrations can range from a number of different setups and API’s, including popular items like Facebook and Youtube video players, Google Map integrations and more.
The Cumulative Layout Shift (CLS) is based on items that move around your site. These are oftentimes unexpected popups, buttons moving or mishaps in responsiveness. These are very easily seen as negative items for a user experience because they often result in an unexpected outcome for a user (false clicks and more).
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