FYI, this is my first post so bear with me. Ever since the new launcher my minecraft was very laggy, and as of 1.6.2, my minecraft will not load worlds. It will start, but when I try to load a world it says "Building terrain" for an abnormally long time and then goes back to the main menu screen. I tried redownloading minecraft (deleted my .minecraft directory) and my launcher but the problem persists. My saves aren't corrupt because i tried making new worlds and nothing different happened. Also all of my saves were created in 1.6.1 or later. Multiplayer still works but is very laggy. I am running the windows version of minecraft on XP (I know, its ancient now). One strange thing I did notice however is that there are 2 javaw.exe processes running with minecraft, and one I believe is for the launcher though it is closed. Anything you know will be much appreciated.
Ever since the new launcher my minecraft won't load worlds