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.
- 1Locate the element or setting causing the issue.
- 2Update it in Webflow.
- 3Publish and validate the output.
After you fix it
- ✓Use Chrome DevTools Performance panel to confirm no tasks exceed 50ms
Same fix, other platforms
Fix long main thread tasks detected on a different CMS
Other fixes
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