Whenever I get into game, my game bugs out so bad that it leaves the game and gives me a bug splat.

I've been doing all the instructions to reduce frame drops and for some reason, whenever I get into a game, the graphics go wild and I drop frames. This has never happened to me. My computer isn't slow or anything but this client has just messed up so bad ever since the new changes. I still use the legacy client. Alpha makes me lag. Snow map makes me lag. AHHH! Is anyone else having this problem? I also play on a laptop WITH ETHERNET. HALP!