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1 document tagged with “Long Tasks”

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A long task is a piece of JavaScript that runs on the main thread for longer than 50 ms and blocks everything else for that time. The user clicks, but the page does not respond. INP shoots up, Lighthouse flags it in the report.

Under the long tasks tag you will find articles on finding them in devtools, which techniques help (yield, scheduler.postTask, debouncing), and when it makes sense to refactor a larger piece of code.

JS Long Tasks (JSLT) Metric: When Your Website Forgets to Breathe

We explain how the JS Long Tasks metric measures digital traffic jams caused by long tasks and what these jams could mean for your users and your business.

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