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> Despite Google's misleading warnings, there is no difference in battery usage between v4.6 in "true background" and v4.9+ with notification.

This doesn't sound like the right comparison to me -- shouldn't they be comparing FCM against the background app/persistent notification approach? Here, it sounds like they are comparing the background app approach against the persistent notification approach, but those are AFAIK basically the same technique, except the latter shows an annoying notification whereas the former didn't. So of course the performance would be the same.

EDIT: After reading the original post it is clear they are indeed not comparing against FCM. They are just comparing two different methods of running in the background. See: https://github.com/Telegram-FOSS-Team/Telegram-FOSS/blob/mas...

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