High Quality Content by WIKIPEDIA articles! Web Workers defines an API for running scripts in the background independently of any user interface scripts. This allows for long-running scripts that are not interrupted by scripts that respond to clicks or other user interactions, and allows long tasks to be executed without yielding to keep the page responsive. Web workers are relatively heavy-weight, and are not intended to be used in large numbers. Generally, web workers are expected to be long-lived, have a high start-up performance cost, and a high per-instance memory cost.

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