I've recently received 2 updates for my Samsung Galasy S5 (SM-G900F) Android 5.0 There was security patch 2015-05-01, and some other update.
I can not prove that, but my battery drains like 3x faster than before updates, and phone is visibly slower. It may be some stuff in my system, but for now I blame the update.
Making it more wired: how could we check, if the producer does not 'break' it's own system (by making it slower, drain battery faster) to switch to a new phone?
Any suggestion on how to track the battery-draining/processor-heavy tasks, or a nice Cyanogen for my phone? It's still under warranty, so I'd prefer not to switch to CM yet.