[BUG] Performance of Canvas UI on some Android devices

Hi all,
we are currently running into severe performance issues on some android devices.
Seems like interactable Canvas / UI Elements are drastically reducing the frame-rate on some Android versions. We can reproduce the issue with the Tiny Arms Revenge Unity Example as well.
Tap responsiveness on UI Elements becomes unreliable / slow.
Changing the build settings from WebGL to Canvas to Auto seems to have no effect.
On iOS performance was good on all devices.

Here is a list of Android devices we were able to test on:

bugged in mobile view NOT in desktop view:

SM-g930f
Android 8.0.0​

bugged in mobile AND desktop view:

SM-G960F
Android 9​

SM-N950F
Android: 8.0.0​

NOT bugged in desktop or mobile view:

SM-G531F
Android 5.1.1​

NOT bugged in mobile and desktop

SM-G900F
6.0.1
​

As you can see older Android versions seem to have no problems.

Please have a look at it! It seems related / similar to that older Bug-report: https://forum.unity.com/threads/performance-consistency-on-android.599959/
Also:
https://forum.unity.com/threads/match3-button-press-bug-v-0-14-1.623509/
Maybe it's not totally fixed / reapearing issue?

Thanx a lot!