Front-End’s Missing Metric: The TBT Window

CSS Wizardry2026-06-01 19:300 views

The TBT Window is the FCP-to-TTI interval used to calculate Total Blocking Time. If FCP or TTI moves, TBT can change even when long tasks do not.

A short note on retry budgets: cap attempts, use exponential backoff, and keep the last error for diagnostics. Related S

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