Game getting crazy lag in 50+ people rooms?

[Annabellz]

So, as of recently, whenever I enter a room that's got more than 50 people in it(no matter the room's size or anything), the game decides to basically die, letting me only be able to move around the room. The other people are just standing there, the chats and PMs don't load, the player created rooms don't load, and if I try changing a room, I get the infinite loading screen. I've tried almost everything, from updating my GPU driver, setting everything in-game on Low(and a min resolution), to reinstalling the game completely, but to no success. Please, help would be very much appreciated.