Well after almost a year on iOS (12 Pro Max) I thought I'd see what the S21 has to offer.
Within 2 days I've packed it back up, still getting delayed notifications, no matter what battery optimization settings I change.
Have had this with previous Samsung devices and never had such issues with other manufacturers (Huawei, Google, One Plus).
Not sure if anyone else suffers from this but it's particularly apparent with WhatsApp. Notifications will come through just fine but after a while when phone is idle I'll get nothing. It's only when I open the app I get a flourish of notifications coming in.
There are a few people who have suggested to disable doze via adb but after being spoilt with the fluidity and stability of such things on iOS I don't see why I should have to tweak to this level, especially on a flagship phone costing almost £1000.
Well i have to say i have never had the isues you are describing. ive had mine from release.(s21 ultra 512gb)
Such a shame really, may have to wait and see what the Pixel 6 Pro offers otherwise it's sticking with iOS.
If anyone has any other suggestions I'm all ears.