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Webflow fix guide

Long Main Thread Tasks Detected on Webflow

JavaScript tasks exceeding 50ms block the main thread, causing jank and poor responsiveness. This directly impacts INP and user experience.

Issue ID: CWV-LONG-TASKS-001Severity: majorEffort: L

Why this matters

JavaScript tasks exceeding 50ms block the main thread, causing jank and poor responsiveness. This directly impacts INP and user experience. This affects load speed, Core Web Vitals, and how many visitors stay long enough to convert.

Webflow fix path

How to fix this on Webflow

Use page settings, Designer, or project settings.

  1. 1Locate the element or setting causing the issue.
  2. 2Update it in Webflow.
  3. 3Publish and validate the output.

After you fix it

  • Use Chrome DevTools Performance panel to confirm no tasks exceed 50ms

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