I'm having trouble understanding what you're asking. If the remove shadows does not work in-game, then that part of the hack is broken and you can do nothing until Zea comes out with a new hack. Even if you turn the shadows off, the game will still probably lag in medium because your computer is trying to produce more detail from a system that doesn't have enough power to do so. The only thing you can do to take away the lag is get a new computer, because if you can't even play the game on medium without lag you're either on an older computer or a cheaper laptop.