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Using Web Workers to Make JavaScript Apps More Responsive

Move expensive JavaScript work off the main thread without introducing unnecessary overhead, communication costs, or new performance bottlenecks.

Muhammad Qasim

13 min read9 hours ago

A web application can have a fast API, a well-designed interface, and efficient database queries and still feel slow.

Sometimes, the problem is sitting right in front of you: JavaScript is doing too much work on the main thread.

You notice it when a search field stops responding while thousands of records are being filtered. A dashboard freezes for a moment while processing a large dataset. A file import makes the entire interface feel broken, even though the browser has not crashed.

The instinct is often to optimize the function causing the delay.…