We just had 50/20 FiOS internet installed and the internet speed on both computers and mobile devices is extremely fast. Data supported from speedtests confirms that the speed is actually over par. The issue is that on the the Xbox the speed is extremely slow during updates and downloads. A 25 mb app takes around 25 minutes. I have opened all suggested ports in the router, but the speed has not increased.
Router: Actiontec m1424wr