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awitek's avatar
awitek
Aspirant
Jul 23, 2016

Xfinity Speed slow with C7000 and R8500 Nighthawk

My setup is a C7000 modem connected to a R8500 router, with the router setup as an AP.  I have Xfinity Blast! internet service at 150Mbps.  When running Xfinity speed test on a wired connection or through a wifi connection, the max speed is 90Mbps. The hardware has all current firmware.  I contacted Xfinity and they have the C7000 on my account.  They also said that they didn't have any issues on their end and if the speed was that slow they would have to send a technician out for a fee.  

 

Anyone else have this issue? Is there a solution to the slow speeds?  Thanks!

8 Replies

  • You didn't specify whether you are getting these results connected through the R8500 or the C7000.  You should isolate the bottleneck.  Check your cables.  A speed test of 90 Mbps could be an indication that one of your Ethernet connections is running at 100 Mbps instead of 1000 Mbps.

    • awitek's avatar
      awitek
      Aspirant

      So I did the following:

       

      1. Disconnected the R8500 from the network.
      2. Run speed test with the wired connection to the C7000.  90 Mbps result.
      3. Factory reset the C7000.  Speed test result of 175 Mbps result.
      4. Reconnected the R8500 to the network.  Speed test result of 90 Mbps.
      5. Factory reset the R8500.  Speed test result 175 Mbps.  

      Now the speed is good.  Anyone know why the factory reset would need to be done?  Anyways, thanks to all that read/replied.

      • TheEther's avatar
        TheEther
        Guru

        Did you, perhaps, have QoS enabled?  QoS is useful for prioritizing traffic on slower Internet connections.  It's not very useful high speed connections such as yours.