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I am surprised nobody mentioned battery saving mode in Opera. It throttles background tabs similar way, but not so aggressively.

This will be great thing. Right now my Chrome eats about 10% of CPU, mostly Skype, Slack, Calendar... With Opera it is bellow 1% and I get much better battery life.

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Even in Opera it is less about throttling cpu usage, and more about coalescing wakeups/timer interrupts.

There should never be a situation where background tab cant even get a 1 second timer running reliably, unless its trying to compute pi at the same time.

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