Long taskWhat it means for you.

A piece of script that keeps the browser's main thread busy for more than 50 milliseconds.

Growth Score · Activation

Definition

What it means

While a long task runs, the page cannot respond to clicks or scrolling. Breaking work into smaller chunks or moving it off the main thread solves the problem. Third-party scripts are frequent sources.

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Guides that cover it

Checkout audit: 12 leaksTwelve places a sale leaks, in cost order, with a test and a fix for each one.When to redesign your siteHow to tell a real redesign need from vanity, and how to do it without losing rankings.Fast for real visitorsRead real visits, then fix images, scripts, layout shifts and the slow start.

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FAQ

Quick answers

What is Long task?

A piece of script that keeps the browser's main thread busy for more than 50 milliseconds.

Where does it sit in Growth Score?

It belongs to the Activation pillar, one of the 12 pillars your score is built from.

What should I read next?

Start with Main thread and Interaction to Next Paint, then browse the other terms in Activation.

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Growth Score reads your site and scores its Activation pillar against sites like yours.

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