Page 1 of 4 1234 LastLast
Results 1 to 15 of 48
  1. #1


    Member Since
    Jan 05, 2007
    Location
    Norfolk, England
    Posts
    225
    Specs:
    White Macbook (refurb), 1.83 GHz Intel Core Duo, 2 GB Memory, 60GB HDD
    Leopard Lag on iMac - How do I troubleshoot it?
    My 24inch 2.4GHz iMac is installed with Leopard and is pretty much an exact mirror of my Macbook, in terms of the programs installed and settings.

    But whilst the Macbook runs completely smoothly, my iMac is very laggy at non-replicable random moments. For example, sometimes I would just be closing a window and it will take 1 or 2 seconds to close it, displaying a beach ball during the lag. Closing another window a moment later will probably be fine. This 1 to 2 second lag with the beach ball happens very often with the smallest tasks; stuff like browsing front row, expose, spaces, opening a new tab in safari. Its a miserable experience especially since my iMac is much more powerful than my Macbook!

    I've got 4GB of Ram too and it happens regardless of how much free ram I have. I've tried to see if there is a spike in any CPU processes when the lag occurs, but there isn't anything unusual. I've looked at the Disk Activity but can't find a pattern between that and the lag.

    I've had this problem ever since I've got my iMac, which is less than a year old. I recently reinstalled leopard to see if it'd make a difference, obviously not. I've run the Techtools Deluxe test which it passed. I haven't run Disk utility yet myself but that's because AppleCare recently changed the graphics card and told me that they ran Disk Utility themselves and found no error. Note: I thought the graphics card was the problem which is why it was replaced but the new one hasn't made a difference - the lag is still there.

    Finally, I do notice that when I wake up from sleep my airport takes ages to connect to my wireless network (around 10 seconds) compared to my macbook which normally connects instantly (I did this test placing the iMac and Macbook in the same place).

    I thought I could work this out myself with the aid of google but now I accept that I desperately need help!

  2. #2

    MacsWork's Avatar
    Member Since
    May 22, 2005
    Location
    Closer than you think.
    Posts
    2,159
    Specs:
    Performa 6116 2GBSCSI 8MB OS 7.5.3
    Open Activity Monitor to see if a program or process that is running either goes unresponsive or spikes CPU percentages during the lag cycles.

    Observe the time and look in Console for events with that time.

  3. #3


    Member Since
    Jan 05, 2007
    Location
    Norfolk, England
    Posts
    225
    Specs:
    White Macbook (refurb), 1.83 GHz Intel Core Duo, 2 GB Memory, 60GB HDD
    I've tried that, but nothing is registered in the console when the lag happens.

    The activity monitor is the same - its never one program that has a CPU spike. It is always the program that I'm trying to do something with, like closing a window, that comes on top of the CPU process list. But like I said, that program is not just one but could be any such as safari, mail, ical, skype etc.

  4. #4

    MacsWork's Avatar
    Member Since
    May 22, 2005
    Location
    Closer than you think.
    Posts
    2,159
    Specs:
    Performa 6116 2GBSCSI 8MB OS 7.5.3
    Did you try the,...

    Create a new user and log in as that user.

    I know you said you reloaded 10.5, but if it was an archive install or you moved your data back, this might determine if there is something corrupt in your profile.

  5. #5

    Chilbear's Avatar
    Member Since
    Jun 14, 2007
    Location
    Toronto
    Posts
    574
    Specs:
    2xiMac24 w Parallels 6 (1x White, 1x Aluminum), iPhone 3GS with iOS5
    I have the 2.4 and a solution from another Forum is to re-establish the "prebinding" use Terminal - I cut/pasted it rather than retyped:

    sudo update_prebinding -debug -root / -force

    I did this and it is running faster so it is worth a try. Wish I could claim the fame but it was my first time in Terminal. Fingers crossed and it can only help. Of course a backup would be wise if you mess something up.

  6. #6


    Member Since
    Jan 05, 2007
    Location
    Norfolk, England
    Posts
    225
    Specs:
    White Macbook (refurb), 1.83 GHz Intel Core Duo, 2 GB Memory, 60GB HDD
    Quote Originally Posted by Chilbear View Post
    I have the 2.4 and a solution from another Forum is to re-establish the "prebinding" use Terminal - I cut/pasted it rather than retyped:

    sudo update_prebinding -debug -root / -force

    I did this and it is running faster so it is worth a try. Wish I could claim the fame but it was my first time in Terminal. Fingers crossed and it can only help. Of course a backup would be wise if you mess something up.
    Is there a way to reverse this if something goes wrong?

    The worst thing about this error is that I can't find a way to replicate it, so I'm not sure if AppleCare will even take it in for repair cos I don't know how to describe it better than "My computer is lagging with all applications but I can't replicate it. It's passed every normal test you propose. Am I screwed?"!

    I'll test out the new user thing and report back.

  7. #7

    Chilbear's Avatar
    Member Since
    Jun 14, 2007
    Location
    Toronto
    Posts
    574
    Specs:
    2xiMac24 w Parallels 6 (1x White, 1x Aluminum), iPhone 3GS with iOS5
    I would guess that is what the back up is for. I typed it wrong and only part of the instructions were done. Nothing happened but I was warned to back up. I gambled and won - I would let it happen as it is not a machine changing event - just an forced update of some system thing. Your call but I gambled and went ahead.

  8. #8


    Member Since
    May 03, 2008
    Posts
    22
    Specs:
    24" Core2Duo with 4GB RAM
    Hey StevenH,

    I exactly facing the same problem as yours!!
    Do you find any solution yet?? Please help!

  9. #9


    Member Since
    Jan 05, 2007
    Location
    Norfolk, England
    Posts
    225
    Specs:
    White Macbook (refurb), 1.83 GHz Intel Core Duo, 2 GB Memory, 60GB HDD
    Do you have wireless problems too? Where sometimes you will wake up from sleep and it ttakes ages to connect to the wireless network? Also, just to make sure we have the exact same setup, do you have the wireless aluminum apple keyboard and wireless mighty mouse?

    Oh for god sake: it's happening right now. Every few sentences it will lag and give me the beach ball. There. There. Not here. There. Grrrrrrrr......

    What do you reckon the chances are of Apple taking this in and just giving me a brand new one?

    p.s. I haven't had time to try out the new user

  10. #10


    Member Since
    May 03, 2008
    Posts
    101
    Specs:
    alienware,mbp,imac(3),blackjack,Hp running macintosh,
    same thing has been happening to my friend

  11. #11

    Soulwar's Avatar
    Member Since
    Jan 27, 2008
    Location
    Estero, FL
    Posts
    1,515
    Specs:
    iMac 17" 1Ghz G4  iPhone 3G  10.5.5
    Quote Originally Posted by StevenH View Post
    Do you have wireless problems too? Where sometimes you will wake up from sleep and it ttakes ages to connect to the wireless network? Also, just to make sure we have the exact same setup, do you have the wireless aluminum apple keyboard and wireless mighty mouse?

    Oh for god sake: it's happening right now. Every few sentences it will lag and give me the beach ball. There. There. Not here. There. Grrrrrrrr......

    What do you reckon the chances are of Apple taking this in and just giving me a brand new one?

    p.s. I haven't had time to try out the new user
    Do you have a wired keyboard and mouse to try?
    Also, do you have iStat installed by any chance?

    Could try Repairing permissions and Verify disk with Disk Utilty.

    Have you tried an Erase and Install? (drastic measure, I know, but when all else fails...)
    When all else fails, try everything!
    The Rep System and you.
    Life's a joke...If you're not laughing, then you didn't get it.

    June 2008


  12. #12


    Member Since
    May 03, 2008
    Posts
    22
    Specs:
    24" Core2Duo with 4GB RAM
    Quote Originally Posted by Soulwar View Post
    Do you have a wired keyboard and mouse to try?
    Also, do you have iStat installed by any chance?

    Could try Repairing permissions and Verify disk with Disk Utilty.

    Have you tried an Erase and Install? (drastic measure, I know, but when all else fails...)
    I had tried all the suggestions searched over the internet.
    But no one can really solve the problem.
    I having an Imac 24"inch, 2.4ghz with 4GB Ram.
    Wired aluminium keyboard and mouse.
    (tried different apply mouse and keyboard, same...)

    Tried repair disk permission - same.
    Tried create new user account - same.
    Tried reset PRAM - same.
    Tried reinstall, erase the disk image, - same.

    What else can we tried?

    I'm locate in Hong Kong, I knew if bring to Apple repair it's nothing can solve, the most I scared about is after repaired, the problem still exists...


    Tried reinstall, same..

    The problem mostly happen to the hardware part mostly.

  13. #13

    Soulwar's Avatar
    Member Since
    Jan 27, 2008
    Location
    Estero, FL
    Posts
    1,515
    Specs:
    iMac 17" 1Ghz G4  iPhone 3G  10.5.5
    When all else fails, try everything!
    The Rep System and you.
    Life's a joke...If you're not laughing, then you didn't get it.

    June 2008


  14. #14


    Member Since
    May 03, 2008
    Posts
    22
    Specs:
    24" Core2Duo with 4GB RAM
    Dear Soulwar,

    I had already done all the updates for Leopard, Firmware etc.
    Meant when now if I going to click the Apple Update, it will tell you that:
    "Your Mac has the latest updates and nothing can be up at this time."

  15. #15

    Soulwar's Avatar
    Member Since
    Jan 27, 2008
    Location
    Estero, FL
    Posts
    1,515
    Specs:
    iMac 17" 1Ghz G4  iPhone 3G  10.5.5
    Did you download the firmware update and try to install it?
    Sometimes the Software update doesn't catch firmware updates.

    It will tell you if it's already installed or not when you try.
    When all else fails, try everything!
    The Rep System and you.
    Life's a joke...If you're not laughing, then you didn't get it.

    June 2008


Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. iMac Audio lag
    By dave1110 in forum Other Hardware and Peripherals
    Replies: 2
    Last Post: 01-28-2015, 12:45 PM
  2. Imac lag
    By loklancaster in forum Apple Desktops
    Replies: 10
    Last Post: 04-26-2012, 04:09 PM
  3. iMac mouse lag
    By cheese81u812 in forum Switcher Hangout
    Replies: 31
    Last Post: 08-19-2011, 05:15 AM
  4. Replies: 4
    Last Post: 09-22-2008, 06:12 PM
  5. Leopard and Virtual Memory Lag
    By Zoolook in forum OS X - Operating System
    Replies: 0
    Last Post: 11-02-2007, 11:25 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •