[BUG] Performance D435 camera incredible poor, Nano gets unusable when realsense-viewer starts

[PaddyCube]

Describe the issue
After installation, I start realsense-viewer to show pointcloud in 3D and Nano (4GB, B01) gets somewhat of unusable. CPU usage raises to 100% on all cores, GPU only gets used a bit. I only get 1-2 fps. Nano gets incredible slow, mouse drags with delay and so on. Ping rate raises from 2ms up to 3000ms with lot of variance. Temperature raises fast.
As soon as I close realsense-viewer (or ROS wrapper with showing pointcloud in rviz), everything works as before.

NVIDIA Jetson Hardware

• [ X] Jetson Nano
  Other:

L4T / JetPack Version
L4T 32.6.1/JetPack 4.6

** Software version**
OpenCV 4.1.1 no CUDA
CUDA 10.2.300

To Reproduce
After installation, start realsense-viewer and try to enable stereo and RGBD in 3D mode

Expected behavior
Getting pointcloud at reasonable performace, e.g. 15fps or even more

Additional context
There doesn't occur any errors beside the ones you showed in your video. Jetson gets powerd by GPIO from a beefy power source which provides up to 10A at 5V. Camera gets recognized as USB3.2 device. It doesn't matter if I attach it to an powered USB Hub or attach it directly.

I wonder if you discovered similar as you say you tested it on JetPack 4.6