LCP is measured by Google as the time it takes to paint its largest, most contentful areas. FID measures how long a user has to wait for input before their desired action can be completed with regards to latency and speed of response. CLS looks at page visits in percentage points based on whether or not they're relatively lightweight interactions like scrolling through a list or clicking an item versus heavier ones such as filling out forms that require full focus - more often than not these are used for conversion rates when measuring conversions from one stage of web browsing (mobile) to another (desktop). To measure LCP efficiently, total blocking time must also be taken into consideration since this will affect both latencies and speeds of responses from your site's servers.