TBT Too High

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Element Code: PE-042

Quick Reference

Issue: Total Blocking Time over 200ms

Impact: Main thread blocked

Fix: Reduce long tasks

Detection: Lighthouse

What Is This Issue?

TBT measures blocking time.

Why This Matters

Correlates with INP.

How to Fix

  1. Break up long tasks
  2. Defer JS

Tools

  • Lighthouse: TBT

TL;DR

Get TBT under 200ms.

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