My PC link / DeoVR Rift has started stuttering pretty hard on any SLR streaming videos over 1920p as of a week or two ago. Before then I had no trouble watching 8K streams, but I was having some issues watching certain saved videos in 8K. Now, ironically, I can watch saved videos fine, but I can't stream SLR videos at high rez smoothly anymore.
For reference, I have a Ryzen 5 3600 CPU and a Radeon 9070 XT GPU (temporarily in my old machine until I can build my new gaming rig). I'm running DeoVR Rift version 14.8.3163 over AirLink on a strong 5 Ghz WiFi connection.