Improving fiber internet speed means knowing what slows it down. Signal interference, bandwidth fights, and old gear can all make your internet slow. With upload and download speeds that often exceed 1,000 Megabits per second (Mbps), fiber optic internet has the capacity to provide a seamless online experience while powering all of your connected devices at once. Issues like. Fiber optic networks are celebrated for their speed and reliability, but even the best systems can encounter problems. When your fiber connection feels sluggish, it's frustrating, especially when you're paying for. Fiber has the fastest internet speeds available today - you won't find anything faster.