Chrome on Android already heavily throttles (or outright kills) background tabs, but Chrome on the desktop has mostly allowed inactive tabs to do whatever they want. Unfortunately, having several tabs open using performance-intensive JavaScript code, like timers, can cause Chrome performance and battery life (if you're on a laptop or other portable device) to suffer.

Google originally planned to start throttling background tabs in Chrome 56, but due to some concerns it would break a large amount of web pages, it was put off. Now the feature has finally arrived, as part of Chrome 57.

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