This script does what it should do: it hides the chat. However, it's inefficient because it does only hide chat and it keeps loading whatever gets said, therefore the chat keeps slowing down your game. It also silgty messes up the layout (but that's not the most important thing anyway). This script is not more effective than just putting the chat on the game-tab or another tab. What would be a huge improvement is disabling the chat connection while the chat isn't visible (to make it stop the lag).