PHILADELPHIA–(BUSINESS WIRE)–Xfinity is giving gamers with Xfinity Internet a free 15-day speed boost just in time for the highly anticipated Nov. 19 launch of Rockstar Games’ Grand Theft Auto VI. The boost raises download speeds up to 2 gigabits per second, so Xfinity members can download and get into the game faster. With the game available for pre-load starting tomorrow, Nov. 10, Xfinity’s speed boost is available for redemption today through Dec. 3. “Millions of people are going to hit do