Now when I play a 3630p 10 bit video in Windows Media Player, the playback is insufferably slow and jumpy. The CPU usage drops to 65% to 80% !! Meanwhile the GPU decoder usage is still 0%.
This means the Microsoft Media Player (with HEVC codec) also suffers from the same issue like DeoVR player ! It's in fact worse, because in DeoVR at least I can make the GPU do the decoding, but in Windows Media Player, there is nothing you can do.