You will no longer receive alerts, banners, and notifications for any apps in your Notification Center. To disable Notification Center, open Terminal and enter the following two commands from Pastebin, one by one, in this order: Luckily you can disable both of them using Terminal. The problem with that is that they take up processing power and RAM that could otherwise be used towards gaming.
Two native OS X features that I never use are Dashboard and Notification Center.
#5: Disable Dashboard or Notification Center (Wait)
