My S6 edge runs like a four year old phone with Lollipop - how is stock even usable?

Basically, the phone is fast when I'm not really using it, and lagging and freezing as heck when it is most depended on.

I have mitigated this by rooting and migrating most of the third party apps from system to user, and freezing other Samsung bloat. But this prevents me from using Android Pay and Samsung Pay.

I have read many threads on memory or multitasking performance issues, but the only stock compatible solution is to use ADB based Package Disabler. This is insufficient unless I also disable Google services, which just gives me a fancy paperweight.

Is my experience not the standard and my device is just defective? I have re-flashed and reset the device more times than I can count and don't see how a hardware defect can cause such software issues.

Basically, the main symptom is that the phone is very slow and even locks up during key times because

1. System apps using more than 1.7 GB ram and less than 300 MB free.

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I have read that Android caches apps, and this is okay. However, the reality is that Android memory manager is actively killing apps at this stage, and apps are actively being re-cached. The free memory continuously fluctuates between 200-350 MB with active CPU and battery drains like crazy. During this time the device is very slow.

2. Compounding on #1, device struggles with Google Maps navigation + Play Music active.

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So bad to the point there is often a one or two minute wait to start navigation. I have moved Maps and Android Web View to user space. This keeps System apps memory usage to ~ 1.2 GB, but also means that now Android memory manager will kill Maps when the screen is off because there is not enough ram available.

3. Some may have noticed I have about 1 GB of memory unaccounted for, and that is the other installed apps are using or caching 1 GB of memory.

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And I do have quite a lot, though not an exorbitant amount. Case in point, my previous Z3 handled the same apps without any hiccups and they have the same amount of RAM. There was also always at least 700 MB of free ram, allowing me to have an active game and Chrome without losing either to the memory manager.

Just upgraded to OH6 5.1.1 (forgoing fingerprint reader without tripped Knox) to see if the issues have been resolved. Unfortunately, the experience is pretty much the same as I had in the beginning.

Is there any way to have a usable device with Android Pay or Samsung Pay?