El Cap iMac 10.11 Internet is SLOW

Discussion in 'OS X El Capitan (10.11)' started by flifish, Sep 18, 2015.

  1. flifish macrumors member

    flifish

    Joined:
    Dec 6, 2012
    Location:
    Wyoming, USA
    #1
    My slow internet is not a wifi issue as I plugged directly into my ethernet. It is so slow that speed tests time out on me. Does anyone else have this problem and or have a solution? A pc near by is racing through the net but i'm stuck in the slow lane on the iMac late2012. I have plenty of memory...
     
  2. beebarb macrumors 6502

    beebarb

    Joined:
    Sep 10, 2015
    #2
    I have an iMac of a similar model to yours, if not the same, and I have no real issues beyond those caused by my router itself.

    But, one thing different about my configuration, is I have disabled AirDrop because the way it works has the potential to cause Wi-Fi and Bluetooth interference, as it constantly forces a hidden ad-hoc Wi-Fi/Bluetooth hybrid network, which some network configurations don't like one bit.

    Try disabling AirDrop to see if that helps.
    As I recall, you disable it by typing the following into Terminal:
    defaults write com.apple.NetworkBrowser DisableAirDrop -bool YES
     
  3. flifish thread starter macrumors member

    flifish

    Joined:
    Dec 6, 2012
    Location:
    Wyoming, USA
    #3
    Thank you for the suggestion. I turned off all airdrops in the house. At first I thought it had worked, but after 3 speed tests none were nearly as fast the one PC in the house. I hate to say the windows machine (a cheap one at that) is beating the "nice" iMac.
     
  4. leventozler macrumors 6502

    Joined:
    Feb 18, 2009
    #4
    try

    sudo su -
    sysctl -w net.inet.tcp.doautorcvbuf=0
    sysctl -w net.inet.tcp.doautosndbuf=0
    sysctl -w net.inet.tcp.recvspace=1048576
    sysctl -w net.inet.tcp.sendspace=131072


    Changes are not permanent, just restart your mac if it doesn't work.
     
  5. beebarb macrumors 6502

    beebarb

    Joined:
    Sep 10, 2015
    #5
    You may need to restart or logout to see the full effect.

    Unfortunately, if this doesn't help, I don't know what else could be causing your problems, as I have limited experience dealing with Wi-Fi problems.
     
  6. flifish thread starter macrumors member

    flifish

    Joined:
    Dec 6, 2012
    Location:
    Wyoming, USA
    #6
    This is NOT a wifi problem. As wifi has been eliminated as a problem. I turned it off and used a cable to connect. Still slow internet. Thanks for trying!
     
  7. DeltaMac macrumors 604

    DeltaMac

    Joined:
    Jul 30, 2003
    Location:
    Delaware
    #7
    OP is NOT having WiFi problems, at least according to post #1.
    He is connecting through ethernet.
     
  8. DeltaMac macrumors 604

    DeltaMac

    Joined:
    Jul 30, 2003
    Location:
    Delaware
    #8
    Have you tried restarting your router?
     
  9. beebarb macrumors 6502

    beebarb

    Joined:
    Sep 10, 2015
    #9
    Sorry, little slip-up there, I meant to write 'networking problems'. :oops:
    Still had 'Wi-Fi' on the brain from recalling how AirDrop works.
     
  10. flifish thread starter macrumors member

    flifish

    Joined:
    Dec 6, 2012
    Location:
    Wyoming, USA
    #10
    Yes, and I even tried a different router. Both routers give the same performance with the iMac but a PC zipped around the internet like a nascar around the track. I troubleshooted for 1-½ hours with my service provider.
     
  11. DeltaMac macrumors 604

    DeltaMac

    Joined:
    Jul 30, 2003
    Location:
    Delaware
    #11
    Have you tried swapping out the ethernet cable on your Mac?

    What OS X version did you use before El Cap?
    Has your Mac generally been slow, or has it only started with El Cap?
     
  12. flifish thread starter macrumors member

    flifish

    Joined:
    Dec 6, 2012
    Location:
    Wyoming, USA
    #12
    Good ideas... The main ethernet may be difficult as I have an odd system and it comes down from the roof.
    I have mostly been out of town since Sept 1. I didn't notice the lackluster speed in August.
     
  13. dsemf macrumors regular

    Joined:
    Jul 26, 2014
    #13
    In the "can't hurt to try" mode:

    System Preferences >> Network, select Ethernet connection, select Advanced, select TCP/IP. Set Configure IPv6 to Link-Local only.

    DS
     

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