I will educate you about FID first input delay metric and TBT metrics because they are related, how to identify FID first input delay and TBT and how to solve them :)
FID measures the time from when a user first interacts with a page (i.e. when they click a link, tap on a button, or use a custom, JavaScript-powered control, scroll doesn't count) to the time when the browser is actually able to begin processing event handlers in response to that interaction.
TBT measures the total amount of time your webpage was blocked, preventing the user from interacting with your page.
Core web vital series
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