For the getting stuck problem, it's most likely a character creation glitch. You can solve it by simply resizing your character. After you log in once on said resized character, and it is fixed, you can just resize it back :^)
As for lag, there's numerous settings that you can change in order to decrease lag, however if you get errors, we can help you if you tell us specifically what the error message states when you get one/when your game crashes. From there we can help you further!