I have the G75V series as well, Game Booster does work with it, and lots of people like it. Though, if you just close the processes you dont use in the task manager you will be fine. When you are running only the game you are playing and maybe a website or two, you will have NO issues what so ever with this laptop, it is simply amazing 🙂
I tried using the Razer Game Booster Video capture but it makes SWTOR crash >_< I have sent in a report to Razer so maybe it will be fixed soon 😄