I'm not sure why this is happening, I was playing before doing Vox Obscura exotic quest, weekly mission and nightfall all running smooth. I switch characters, and I get this. I have an Ethernet wired cable, so it's not that. But often I'm seeing an invader, hit the Titan Bubble and I can slowly just see them bit by bit with lowered latency.
What is the issue?
Apparently there is a GPU VRAM leak that grows over time to the point the graphic card doesn't work right anymore and severely hampers visual performance; it could explain your video...