Shader Spiking, Slow load screen times and misssing textures

Loading in and out of mirage is insanely slow and so is back into hideout. shader is constantly spiking on graph but worst of all textures arent loading. Sirius in eagon map did not load walls so got 1 shot 3 times, chaos balls are not loading and other boss mechanics are not showing visuals.

Have tried clearing cache, changing renderers, updating drivers. Have never had this issue in the last 6 seasons. In fact did a practice run before league launch and had zero issues then

I am having the exact same issue. can barely clear any end game content because the boss fights are impossible like this. Was not like this before league start and I know because I was playing consistently up until this league launched. global chat is useless as well in helping as expected. I know its not my computer