[YarickR2]

They are doing that by polling private servers, which is sometimes less efficient power-wise, and sometimes notifications are being delivered slower than in case of using Google-provided mechanism (FCM). We've been using ntfy for alerting, using our private server and running ntfy client in polling mode, and I do not see significantly increased battery usage by the ntfy client; Android 15.

[orblivion]

So ntfy Android app polls a ntfy service. (Which is more efficient than each app polling separately) What does Google's Android library do if not also poll? Does it run a server on the phone? Does it get special signals from cell towers that most apps don't have access to?

[freeone3000]

It also polls, it just does it as part of the OS. Power saving by the OS can often interfere with apps like nfty that want a long-running background process, especially if they haven’t been opened in a while.