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What websites do CPU-intensive work that can be delayed for hours?

In general I want a website to suck as much power as possible so it can be done sucking power as soon as possible, whether I'm on battery or not. If you want to find waste, track execution time and bandwidth use.

I'm not sure I understand your point. Many apps (would) benefit from delaying some tasks and waiting to be on charge and a wifi connection. Typically, synchronization for example requires the device to be awake for a long period because of network roundtrips, transfers, disk seeks and CPU work. Software updates are similarly impactful on the battery.

At least, it makes sense to measure battery usage to optimize your code. And in my opinion, it's also beneficial to react to battery events (delay when on low battery, process when on a wall socket) and network events (bad coverage vs. strong wifi).

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