trouble playing 4k videos on youtube on nvidia gtx 960

This way I can usually get h264 version of most vids.

Generally though I just use mpv, either from cli or a firefox extension. Here on an older laptop I've no vp9 support for hwdec, 99% of youtube stuff is fine in the browser inc. Anyone know how I can fix this? I'm using a 4k display and would like to watch 4k content when possible.A lot of youtube hd & uhd content is using vp9, how's vp9 support on your gpu? I'm using the NVIDIA driver metapackage 390, which is the recommended option. So far I tried turning off hardware acceleration in firefox, tried other web browsers, and did test the streaming option in VLC, it won't even switch to HD, even though I turned that setting on. It only happens when I watch in 720p and above, no issues in SD.

I'm guessing that it goes from 30/60fps down to 10-ish. It seems to slow linux down entirely, not too sure though (the mouse cursor slows down with it). Brand, ASUS Graphics Coprocessor, Nvidia GeForce Video Output Interface, DisplayPort, DVI, HDMI Chipset Brand, NVIDIA Graphics RAM Type, DDR5 SDRAM. I'm using Kubuntu 18.04 with a GTX 960 GPU, 8GB DDR4 RAM, and a NVMe M.2 SSD, so everything is fast as expected except for when I watch a HD video on YouTube in full screen.

Trouble playing 4k videos on youtube on nvidia gtx 960