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Total Blocking Time (TBT) | Articles | web.dev

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Published: November 7, 2019, Last updated: October 15, 2025 What is TBT? The Total Blocking Time (TBT) metric measures the total amount of time after First Contentful Paint (FCP) where the main thread was blocked for long enough to prevent input responsiveness.

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Total Blocking Time (TBT) | Articles | web.dev
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