Do Chrome Background Tabs Pause `setTimeout` and `setInterval`?

Chrome Background Tabs: Timeouts and Intervals Paused?

In testing the accuracy of setTimeout, it has been observed that timeouts run substantially slower in Chrome background tabs compared to active tabs. This behavior has not been noticed in Firefox or Internet Explorer.

Suspension of JavaScript Execution

It appears that Chrome suspends or slows down JavaScript execution in unfocused tabs. This implies that background tasks, such as periodic server checks using XHR and setInterval, may be interrupted. It is suspected that setInterval exhibits similar behavior.

Possible Workaround

As a potential workaround, Web Workers can be utilized to continue background tasks even when a tab is inactive. Web Workers are independent scripts that run in the background, allowing asynchronous tasks to proceed.

Bug Reporting

While the behavior of suspending JavaScript execution in background tabs is believed to be deliberate, it could warrant filing a bug report if it is causing significant issues. The provided code change may shed further light on the situation.

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