Window switching and screen choppy after initial boot.

In OpenSuse/KDE the screen gets choppy and erratic when switching between windows or opening windows or using the KDE menu. The behavior doesn’t appear until about a minute or less after starting OpenSuse.

When this behvior appears, I open Compositor and change the value of “Rendering Backend” or “Tearing Prevention”. It doesn’t matter what I change it to, Just changing it and saving the settings clears up the problem for the rest of my session. No matter what I change it to, behavior appears after next boot.

Any idea how to fix this?

OpenSuse Leap 42.1
KDE Frameworks 5.16.0
The command “/sbin/lspci -nnk | grep VGA -A2” returns:
00:01.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Wrestler [Radeon HD 6310] [1002:9802]
Subsystem: Acer Incorporated [ALI] Device [1025:0602]
Kernel driver in use: radeon