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What is FID in concern with Page Speed?


Maria Jonas

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It is time interactively (TTI) is a metric that measures how long it takes your application to load and be able to quickly respond to user interactions, and delaying the first input (IDF) is a metric that measures the delay experienced by users when interacting with the page while it is not interactive.

 

 

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A URL's speed is the slowest speed assigned to it. So if a URL on mobile has slow FCP but moderate FID, the URL is labeled slow on mobile. If a URL on mobile has moderate FCP but fast FID, it is considered moderate on mobile. A URL on mobile with fast FID and fast FCP, or fast FID and no FCP data, is considered fast on mobile.

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Time to interactive (TTI) is a metric that measures how long it takes your app to load and become capable of quickly responding to user interactions, and First Input Delay (FID) is a metric that measures the delay that users experience when they interact with the page while it's not yet interactive.

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