this is happening without watching any video, just enter the app main screen, do not open any video.
my cpu is 9700k, cpu usage is quite low (20% or lower) in the main screen, but GPU usage is 85% above for RTX 2070 super
(watching H.265 or 264 video is fine, when watching video, the gpu usage is about 2-3% higher, about 88%, and cpu usage is about 10% higher, so the problem has nothing to do with codec or video, it's the app UI itself consuming super high GPU resource for no reason, because it is black and doesn't render anything at the point)