I never hated on Signal, on the contrary I recommend it too many people but I can say that the energy consumption on Android is in many cases abysmal for multiple years now and related issues in the Github issue tracker are being ignored. This is for me unacceptable for someone claiming to build high quality software and accepting my donations.
Related issues:
https://github.com/signalapp/Signal-Android/issues/13704 https://github.com/signalapp/Signal-Android/issues/12341 https://github.com/signalapp/Signal-Android/issues/10336 https://github.com/signalapp/Signal-Android/issues/9729