Slowly degrading wireless download speeds

Discussion in 'iMac' started by Lodesman, Feb 4, 2014.

  1. Lodesman macrumors regular

    Lodesman

    Joined:
    Feb 4, 2014
    Location:
    Folkestone, Kent, UK
    #1
    Hi I'm a newbie here.

    I bought my first iMac (late 2013) after using iPhones/iPads and am finding that the wireless download speeds degrade significantly over days.

    I normally get 65-70 Mb/s but with my iMac this slowly degrades to 20-30Mb/s over a few days.

    The problem is rectified by switching off and restarting WiFi. However I am sure I should not have to do this.

    Any suggestions ?
     
  2. Gav2k macrumors G3

    Gav2k

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    Jul 24, 2009
    #2
    Try changing your wireless channel as a first port of call.
     
  3. ElectronGuru macrumors 65816

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    Sep 5, 2013
    Location:
    Oregon, USA
    #3
    Assuming you mean Internet speed you should also try an ethernet test to make sure that the problem is in fact Wi-Fi.
     
  4. Lodesman thread starter macrumors regular

    Lodesman

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    Feb 4, 2014
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    #4
    Thanks for your advice.

    I am using WiFi at the moment and I will try using an ethernet cable (a pain in the neck due to distance).

    I doubt if it is my router as the problem of degrading download speed is rectified by switching off the Wifi on the iMac and then switching it on again.
     
  5. Lodesman thread starter macrumors regular

    Lodesman

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    #5
    Still have difficulty with slowly downgrading wireless speeds. The problem is solved by stopping and restarting the iMac WiFi. The normal speed then slowly degrades to 20-25 Mb/sec download over about twelve hours

    My router is maintaining a very stable 68-70 Mb/sec download and 18 Mb/sec upload throughout so it is not the router having difficulties. It would appear to be my iMac WiFi.

    Using an ethernet cable (really inconvenient) maintains full speeds but I would prefer to use WiFi.

    Any more suggestions ?
     
  6. ElectronGuru macrumors 65816

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    Location:
    Oregon, USA
    #6
    Without someone to come along who has already figured out this specific issue, you need to keep eliminating variables...

    Make sure it's not the Internet by testing local content source

    Determine if it's the base station, try a second base station or do pier to pier

    Determine if it's the iMac, try another device

    Determine if the problem is hardware software, restart with an independent OS. If the problem goes away, The problem is somewhere on your drive.
     
  7. xraydoc macrumors demi-god

    xraydoc

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    192.168.1.1
  8. Lodesman thread starter macrumors regular

    Lodesman

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    Feb 4, 2014
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    #8
    Again, many thanks for all the helpful input, folks.

    I'll keep plugging away and hopefully ...........................!
     
  9. SoAnyway macrumors 6502

    Joined:
    May 10, 2011
    #9
    This is probably an issue with your router.

    I have the same issue at my place where our download speeds get ridiculously slow after a week. I then unplug the router for a few minutes then plug it back in and all is well for the next week or so where I repeat the process.

    I've been meaning to get a new router for a while now but haven't gotten around to doing so.
     
  10. Lodesman thread starter macrumors regular

    Lodesman

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    Folkestone, Kent, UK
    #10
    I have my router also connected wirelessly to my wife's Windows PC and it maintains a steady 68-70 Mb/s download so I am reluctant to believe that the router is at fault (it's only six months old and operates on both the 2.4 and 5 ghz channels).

    Both the PC and the iMac are using the 5 ghz wireless channel and it is only my iMac that shows this slow degradation of speed.

    Strange.....
     
  11. SoAnyway macrumors 6502

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    May 10, 2011
    #11

    But all your other devices on top of the iMac are experiencing the slowdown in speed right?
     
  12. Lodesman thread starter macrumors regular

    Lodesman

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    #12
    Our iPhones and iPads have never been able to utilise the maximum speeds available and they operate at about 25/30 Mb/s download. Apart from my 5S the other iPads and iPhones are a couple of years old so I am not surprised.

    Our PC and iMac are capable of accepting the higher speeds but it is only the iMac that, after a iMac WiFi reset, gives the higher speeds and these slowly degrade over about twelve hours. Resetting the iMac Wifi restores these speeds.

    Our 5 year old PC (with dual channel Wifi dongle) gives steady downloads of the higher speeds.

    Resetting the Wifi on the iMac each morning is not a great hassle but I would prefer that I did not have to do this.
     
  13. SoAnyway macrumors 6502

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    May 10, 2011
    #13

    Hmmm, I don't know what else it could it.

    If it's just the iMac, have you thought about reinstalling OS X or perhaps cleaning out your user preferences folder?
     
  14. Lodesman thread starter macrumors regular

    Lodesman

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    #14
    Sorry to be a bit thick but what should I clean out from the preferences folder ?
     
  15. Slow Programmer macrumors regular

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    Jun 25, 2011
    #15
    Are you using an external usb 3.0 hard drive? If so try unplugging it the next time your speed drops.
     
  16. Lodesman thread starter macrumors regular

    Lodesman

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    #16
    Yes I am using a usb 3.0 LaCie 2TB external HDD.

    I'll try your suggestion, many thanks.
     
  17. Lodesman thread starter macrumors regular

    Lodesman

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    #17
    Tried ejecting my external HDD when speed dropped but no difference.

    Still had to stop and restart my iMac WiFi to restore download speeds.

    Thanks for the suggestion anyway.
     
  18. Macman45 macrumors demi-god

    Macman45

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    Somewhere Back In The Long Ago
    #18
    I'd borrow another router just to be sure...sounds like a hardware based issue on the device itself to me.
     
  19. Lodesman thread starter macrumors regular

    Lodesman

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    Feb 4, 2014
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    Folkestone, Kent, UK
    #19
    Solved !!!

    Well, after a lot of gaffing around I finally bit the bullet and bought an Airport Extreme and "hey presto" download speeds are steady and consistent.

    A steady 65 mb\s download and 19 mb/s upload.

    I guess it was my old router after all. My (UK) BT Homehub 4 is now on the shelf in my workshop where it will remain.

    An expensive remedy but worth it in the end.

    Thanks for all your help.
     
  20. cynics macrumors G3

    Joined:
    Jan 8, 2012
    #20
    Oddly enough I just checked my transmission rate for the first time in a while. It was around 150 and staying there. I thought that was odd, turned wifi on and off and it back to 750ish. See sig... Probably just a coincidence but I'm gonna keep an eye on that...
     
  21. worldbrain macrumors newbie

    Joined:
    Apr 2, 2014
    #21
    compare wireless adapter

    I suggest a USB mini-wireless adapter, if the performance is better, try changing out the on-board wireless adapter...if your machine has been worked on requiring prior removal of the adapter, the round antennae ends may not be clasping tight around the connection. They can distort, if not removed properly.

    ----------

    ...refreshing the wireless router helps, have seen that often .
     
  22. Lodesman thread starter macrumors regular

    Lodesman

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    Feb 4, 2014
    Location:
    Folkestone, Kent, UK
    #22
    Thanks Worldbrain, I have sorted my problem by replacing the router with the Apple Airport Extreme.

    No degradation of download speeds at all now.
     
  23. worldbrain macrumors newbie

    Joined:
    Apr 2, 2014
    #23
    good show

    ...cool bro, glad it all worked out,
     

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