7 Replies Latest reply: Jan 16, 2013 1:52 PM by garyc0424
garyc0424 Level 1 (0 points)

my imac is slow to download from the internet, my isp provides download speed of 50 mbps, my imac speedtest is only 35mbps, yet my macbook will downlod at 50 mbps, I have run the speediest both hard wired and with wifi

iMac (21.5-inch Mid 2011), OS X Mountain Lion (10.8.1)
  • BDAqua Level 10 (122,286 points)

    Open Network Utility in Applications>Utilities>Info tab, select Ethernet & what is the Link Speed & are there any Errors/Collisions on the right?


    Open Network Utility in Applications>Utilities>Info tab, select Airport/Wifi & what is the Link Speed & are there any Errors/Collisions on the right?

  • a brody Level 9 (65,758 points)

    Every computer connected simultaneously will slow down your connection.

  • garyc0424 Level 1 (0 points)

    The iMac and MacBook were speed tested independently, not simultaneously also a Fibreop technician  teted his pc laptop. The MacBook and the pc tested at 50 Mbps the iMac only 35 Mbps . Thanks for the replies

  • garyc0424 Level 1 (0 points)

    BDAqua..my Ethernet Link Speed is 1Gbit/s, there are no errors or collisions.

    Thanks for the suggestion, any other ideas?

  • BDAqua Level 10 (122,286 points)

    One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...


    PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive


    Reboot, test again.


    If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport, or some USB or Firewire device, or 3rd party add-on, Check System Preferences>Accounts>Login Items window to see if it or something relevant is listed.


    Check the System Preferences>Other Row, for 3rd party Pref Panes.

    And in your instance it might possibly be Spotlight or Time Machine messing with you...


    Open Activity Monitor, Show:>All Processes, sort on CPU%, see if anything using too much CPU% when this happens, click on Memory tab, do you have many Pageouts?


    Open Console in Utilities & see if there are any clues or repeating messages when this happens.

  • a brody Level 9 (65,758 points)

    Is Printer sharing or iTunes or iPhoto sharing turned on in the iMac? If it is trying to enable Rendezvous without other devices that can still eat up bandwidth.  Turning off sharing on all applications that can share unless absolutely needed can help speed things along.

  • garyc0424 Level 1 (0 points)

    Thanks everyone for all your suggestions, I attempted them all with the exception of the safe boot, I'm a bit out of my depth there. Still only getting downloads of 35 Kbps when I should have 50 Kbps, oh well, 35 ain't bad.