What Total Blocking Time (TBT) measures
Measures the total time the main thread is blocked and unable to respond to user input during page load.
Glossary: Total Blocking Time (TBT)
Total Blocking Time (TBT)
Measures the total time the main thread is blocked and unable to respond to user input during page load.
How to measure Total Blocking Time (TBT)
Sum long tasks between FCP and Time to Interactive to understand JavaScript impact on responsiveness.
Why it matters
Lower TBT means fewer interaction delays and better momentum for key conversion steps.
Metric monitoring made continuous
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