This is a serious performance problem that needs to be addressed. Apparently this is a recurring issue among mac users. Game Mode is a feature that is triggered whenever a recognized game is launched in full screen. It significantly boosts performance (we're talking about 20 fps boost here) and it makes the main game run smoothly without any issues. However, whenever I launch TModLoader, the window never pops up. You can't really launch it manually because it needs a game to allocate memory to, and if it doesn't recognize the game, it won't work. It makes even normal (without mods) TMod slow and unplayable. It's horrendous with mods like calamity and starlight river installed. Really needs fixing.