My download speeds slow down everytime.

Discussion in 'iMac' started by JBradley500, Aug 16, 2009.

  1. JBradley500 macrumors newbie

    Joined:
    Aug 5, 2009
    #1
    i have verizon dsl and live out about as far as you can and still get dsl.

    the problem im having has just been since i got my new imac. it will start downloading around 85-90 kb then just slows and slows consistently and gets around 10 kb. sometimes if i stop then resume the download it will start back up at the faster speed but then slows again. sometimes if i stop it, it cant resume for some reason.

    is this my isp problem or is it something with my computer or settings?
     
  2. iLog.Genius macrumors 601

    iLog.Genius

    Joined:
    Feb 24, 2009
    Location:
    Toronto, Ontario
    #2
    Probably your ISP/Connection/Plan. To get a rough idea of your connection's speed, go to www.speedtest.net and select the closest area and then post back your results here. It will give us a rough idea at what your speed should be and how you should proceed to fix your problem.
     
  3. belvdr macrumors 603

    Joined:
    Aug 15, 2005
    #3
    The high speed at first and then ratcheting down is a function of TCP/IP. It works to get the best rate possible. Assuming you are wired, or have a very good wireless signal, I'd call your ISP.

    When running that speedtest, I'd go hardwired to be sure wireless isn't causing any issues. Also, what is the advertised speed of your link?
     
  4. Zortrium macrumors 6502

    Joined:
    Jun 23, 2003
    #4
    Not exactly -- TCP works to achieve the highest speed possible without dropping packets but operates at a very fine granularity, so you should never see any impact that's a result of TCP operation. ISPs, however, do often give you faster initial speeds for a bit, then slow down to your actual speeds. This is great for marketing, as they can advertise the fake speed as the "omg high speeds", when typically the line is only actually 50% of that or so (see Comcast PowerBoost).
     
  5. belvdr macrumors 603

    Joined:
    Aug 15, 2005
    #5
    Right and when the high speeds initially start out, if there are errors or if the line cannot support that continuous rate, TCP will crank down the speeds until it can get an optimal rate. If bandwidth is freed up, then TCP will increase the transmission rate to find that optimal spot again. This was seen on dialup modems all the time, where the download started out at say 50 KB/sec and then crank down to get around 5-7 KB/sec. This may or may not have anything to do with the ISP and their marketing schemes.
     
  6. JBradley500 thread starter macrumors newbie

    Joined:
    Aug 5, 2009
  7. belvdr macrumors 603

    Joined:
    Aug 15, 2005
    #7
    What's the data plan you are paying for? Is it a 768k/128k line by chance?
     
  8. JBradley500 thread starter macrumors newbie

    Joined:
    Aug 5, 2009
    #8
    Right off hand I can't remember it's been so long but I do think your right because I live out so far I couldn't take advantage of the faster option. I believe I'm the last person before they stop offering dsl.
     
  9. alphaod macrumors Core

    alphaod

    Joined:
    Feb 9, 2008
    Location:
    NYC
    #9
    That most likely means your very far from the central office and you're lucky to even get a connection; when I got DSL I had constant drop-offs.
     
  10. JBradley500 thread starter macrumors newbie

    Joined:
    Aug 5, 2009
    #10
    I'm quite a way out. I asked the guy who installed the dsl, who happens to be my cousin, and he estimates 20,000'.
     
  11. zmttoxics macrumors 65816

    zmttoxics

    Joined:
    May 20, 2008

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