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
- Break up long tasks
- Defer JS
Tools
- Lighthouse: TBT
TL;DR
Get TBT under 200ms.
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