>>365451545
i did this a while back and the framerate barely increased. i think what you're describing is what happens if you're running an older GPU like a 970 or if you're running out of VRAM.
you are NEVER going to hit 144fps with 80 people in the instance. the overlay might be shoving 144fps in your face, but the game certainly won't be pushing that framerate at all. there is simply too much going on in the main thread to hit 80 players and still keep 144fps, sorry.
the way i keep my framerates up in very large instances is decreasing supersampling to 1x because I'm partially VRAM-limited (older card), and using advanced safety to limit the number of meshes and materials people can use (without having to hide/fallback them altogether like VRC's dogshit perf rank system).