Comcast XFINITY Speed Test
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Modem Speed Test - Check Your Internet Connection Speed
If you are not getting your subscribed Internet speed, there may be several issues at fault. Here are some things you can try before calling your cable provider. First and foremost, when running a speed test, make sure only the cable modem is connected and disconnect any router. Running a speed test on a modem with a router connected will not give you an accurate reading. Since the routers job is splitting the speed and signal to multiple devices, a true speed test result will not be given.