iTunes 10.5 CPU Issue

After the recent iTunes update (10.5) I noticed the


was suddenly chewing up CPU – everything still seemed to be working, I could still sync devices, it was just grinding the PC towards an early grave.

A bit of Googling suggested it’s a common problem and previously a reinstall of iTunes was the suggested fix – unfortunately this didn’t work for me, nor it would seem for a lot of people at version 10.5.

What did work for me was doing a

netsh winsock reset

from a command prompt (as Administrator) followed by a reboot.

Apparently the Windows TCP/IP stack can get corrupted and this will reset the Winsock Catalog to its default state – i.e. one that works properly.

It certainly fixed my iTunes problem and as a bonus the PC now boots faster and general network performance seems to be improved – one to remember!

81 thoughts on “iTunes 10.5 CPU Issue

  1. Thanks!
    I too tried an itunes reinstall and was unsuccessful.
    Your tip worked a charm!
    Now I can actually do that iOS 5 update for my iPhone. 🙂

  2. Thank you. Thank you. Thank you! I had uninstalled and reinstalled three times trying to get this to work. Then, I found this page, typed that one line in, rebooted, and all is well!

  3. Bless you! I tried for hours last night to update to iOS 5.0 and had no luck because the Backup process would just hang. This resolved it.

    Again, I thank you very much!

  4. Hello Steve!
    Thanks a lot. I can’t remember how often I removed and deinstalled iTunes with each saftey update!


  5. Great tip. Worked for me as well.
    After 3 days of annoying reinstalling of itunes this was the perfect hint.
    Apple should publish such stuff on their site.

  6. OMG!! Bambers… you are the miracle worker. I found you post on Apple discussion boards about AppleMobileDeviceService.exe chewing up CPU and previously a reinstall of iTunes was the suggested fix. This also didn’t work for me. But your “netsh winsock reset” worked like a charm. Thank You! Thank You! Thank You!!

  7. BUT do note a “netsh winsock reset” will almost certainly stop your Anti-Virus monitoring anything that comes from the Internet, so you might want to sort that out afterwards!
    (As it will nuke the hooks it has in the networking stack.)
    You might want to do:
    netsh winsock show catalog > c:before.txt
    netsh winsock reset
    netsh winsock show catalog > c:after.txt
    To see what got nuked…

  8. I have wrestled – NO let’s it was a WAR – with this issue on one computer that I manintain in our organization. It was terrifiying every time the client called with the persistence of the issue – notwithstanding the instructions from the typical forums to uninstall everything Apple and reinstall (to NO effect, of course). Let’s see if this is a permanent fix. THANKS FOR THE SOLUTION.

  9. After weeks of toil, this solution did the trick. When iTunes started up my entire system came to a halt and CPU utilization went up to 100%. No amount of reinstalling iTunes would help.

    Heaven forbid this fix be mentioned on the Apple site. I could have saved hours of anguish if only I had this in hand.

    A million thanks.

  10. I have the same issues when iTunes upgrades. 50% is taken by iTunes, 50% by the AppleMobileDevice. I deleted, reinstalled and still had the same problems until I did the netsh winsock reset. Everything is smooth now.

    Thank you, this saved me hours of aggravation.

  11. Absolutely brilliant! Worked 1st time for me… Thanks so much for sharing this important info.

    Cheers, Duncan

  12. didn’t work for me – saw this problem immediately after upgrading to iTunes 10.5. Cannot cpnnect to iTunes store nor sync devices. 😦

  13. Boy – wish I had found this about 8 hours ago!!!! Worked like a charm!!!!! Thanks for the post!!!!!

  14. Holy cow. This worked for me as well. Not only did the resources go back to normal but my iPad now backing up which was giving me all sorts of problems before.

    Great tip. Thanks!,,,,m,m,m,m

  15. SOLVED! First uninstall iTunes, then reinstall iTunes, then install all associated components found in the Apple Software Update, then do cmd prompt (do cd.. twice to go back to the c: drive), then type in netsh winsock reset and hit return.

  16. No need to uninstall/reinstall for us. Simply ran the ‘netsh windsock reset’ and we were good to go. Thank you so much!!!

  17. Thank you, you are a life saver. I was thinking to format my pc and you rescue me 😉

  18. OMG this is awesome. I was going to try uninstalling but saw this and it was easy. IT WORKED. Thank you for your help!

  19. When I try that command, I get “The requested operation requires elevation.” Any suggestions? I am logged into the administration account and then open the command prompt from the Accessories folder.

  20. hi mike – what version of windows do you have ?

    you might need to start the command prompt window ‘as administrator’ to get the right permissions – right click on the command prompt shortcut under the accessories menu and see what options you get

  21. Again, as with everyone else, this worked perfectly. I fought this for a couple days and this took care of it in a few minutes!! Yea!

  22. Hi

    I reset the Winsock catalog as instructed and when I reboot the high CPU usage problem is fixed- however when I reboot again the high CPU usage is back and Apple Mobile Device Service again takes up 100% of the CPU.

    Any ideas?

    I’m using Windows XP

  23. OK, I’m pretty jealous because I thought for sure this fix would work for me too, but it did not. iTunes is the only program I have that does this. I have tried updating all of my drivers, uninstall/reinstall, reset winsock, etc. NOTHING!!! Anybody else have any further suggestions. This is SUPER irritating, iTunes crashes my Windows 7 64bit Ultimate after a few minutes of running, most typically after I try and sync my iPhone 4s. ANY help or further suggestions would be GREATLY appreciated!!!

  24. I dont have Windows 7 but i think a reset requires slightly different commands – try doing

    netsh winsock reset catalog
    netsh int ip reset reset.log hit

  25. Running Win 7 on my maching, never had a problem. Win XP on my wife’s machine… big problem. So far resetting Winsock has taken care of it. Thanks!!!

  26. I tried the winsock reset. Didn’t work. Still can’t sync. Can’t understand what’s causing this, but clearly it’s a huge issue across the world.
    Am considering installing a clean iTunes 10.4.xx (with auto update for itunes disabled) and then re-ripping my music which luckily was limited as I listened to podcasts mainly.
    But my wife has her whole catalogue of music on her iTunes on a different PC. How lucky we decided not to use one iTunes to sync!
    Does give one huge confidence with creating a significant iTunes library.
    But hey guess what, I’ll be taking copies of the library on a regular basis. And especially before choosing to upgrade manually.

  27. Thank you Thank you Thank you Thank you!!!!!

    I’ve F**ked about pulling my hair out trying to fix this and in 1 minute its done! For the record I have XP service pack 3 and it was a simple fix.

    Cheers….Here’s a virtual beer!! :o)

  28. THANK YOU THANK YOU THANK YOU!!! I hadn’t considered that this could be the cause! What a great day this is, after a crappy start!! You guys are awesome!

  29. HELP!!!!!

    I need the absolute idiot’s guide on how to do this. I’ve done the uninstall/install twice now and nothing. The minute I open itunes or attach my iphone 3gs the CPU goes up to 100 and stays there until I re start.

    It’s driving me daft – just hope I can get it sorted….

    Ta 🙂


  30. Thank you!! At first I think it was my really old laptop. I almost consider throwing it away. Luckily I googled and found your solution. It works like magic!!

  31. Linda, once you start up your computer, DO NOT START iTunes or plug in your phone. All you need to do is go to your start menu. For Windows XP, go to run and type cmd. Once that pops up, follow the instructions above. For Vista or Windows 7, open the start menu and type cmd in the search box at the very bottom of the start menu. Again, just follow these instructions from there. Hope it helps!

  32. You are a legend man. you should send Apple a bill because I’ve seen so many unanswered posts on apple forums. I never associated my itunes appstore not working with the high processor but it makes sense now.
    by the way Linda, make sure open command prompt in administrator mode.
    when you type in CMD in the search, wait until it finds the program in the list above (the icon is black background with white letters). then right click on it and click Run as Administrator. follow instructions above and then reboot PC.
    happy days! 🙂

  33. Thanks for this excellent post. This issue has been driving me and my laptop crazy for the past 2 weeks.

    If the Internet had a homepage, then this post would have to be on it.

    Many thanks.

  34. This worked for me after reinstalling iTunes, PC Tools software and other fixes did not. As a bonus it also resolved a problem that prevented my iPad from syncing to iTunes.

    This problem has been frustrating me since June. Thanks so much!

  35. Thanks a lot for the tip. Even the guy at the help-desk center couldn’t help me. And he was an Apple-guy.

  36. Thanks so much for this solution as I am a non-technical person and after being without my iPad2 for over a week my family said I was getting kind of grumpy as I could just not solve this problem and was extremely frustrated.

    I am a bit concerned about the posts in this string about potential problems with anti-virus after implementing this solution. Have those concerns been confirmed or rebutted?

  37. Thanks Chap!!!!! I am free from the depression of a sloooooow Windows XP PC at last…..

  38. Yay! It works! You are a genius!! Thank you so very much! Awesome, amazing, and a life saver!

  39. You are the sunshine of my life. Actually, I think it was Apple’s attempt to destroy the planet by Global Warming. A few hundred million processors running at 100%…

  40. oh wow! it works!!!! thx a lot – i didn’t know what else i could do and now everything is fine! i can synch + purchase again. thanks, thanks, thanks!!!

  41. Thanks the solution worked for me, however when I shutdown my computer and restart Apple Mobile Device starts chewing up the CPU again.
    I have to either stop the device manually or do the winsock reset again….any
    suggestions ?

  42. I just wanted to say thanks, worked (for the time being) on my PC. Its been bugging me for ages!
    May well spend some time looking though the rest of your stuff!

  43. My brother recommended I may like this blog. He was once entirely right. This submit actually made my day. You can not imagine just how much time I had spent for this info! Thanks!

  44. It worked! Thank you, thank you, thank you. Why apple won’t help you on this one for free I don’t know as it stops you from indulging in their holy grail … Spending money on itunes!

  45. This is unbelievable! It actually works for real – don’t know how and why, but it solved the CPU issue. Thank you very much!

  46. Gonna try this. But, if I may ask, where did you find it, or how did you come to do exactly this? Must be interesting 🙂

  47. That makes sense. Hijackthis scans were picking up three entries with unknown files in Winsock LSP but I was reluctant to remove them. After running winsock reset command things are back to normal. Thanks for the post.

  48. Thanks for the solution, it works perfectly now! I was at a complete loss as no other suggestions worked.

  49. Thanks very much, it worked, but iTunes still uses 50% CPU when it’s opened… Is that normal?

  50. Wow. And it is so easy to fix 🙂 Apple should really compensate you. What a trash of Apple services resolving this problem!!!! Not even in the 10.5.2 update!?!?!!? And now with your solution we can go back and buy apple music and applications? They should really pay you

  51. Wow. I have an i7 975 @ 3.33 GHz with 6 GB of memory running on Vista 64. This applemobiledeviceservic took it down to 30% free and 100% memory sometimes. THANK YOU FOR THIS FIND!!!! I took before and after ss of task manager, now runing 99% free. Also did logs of the free HijackThis before and after but have not diagnosed yet.
    Apple has to be the programing TEFLON company of all time! If any other company put out a product that crashed systems they would be out of business. I also had the same backup issues with my ipad that many have. finally took off apps, redid, and put the same apps back on and it has been working fine. But I have now WASTED a good 40 hours of my life due to this and the ipad issue.
    Thank you, thank you, thank you to you
    Shame, shame shame to Apple programmers.
    John in MN

  52. Thank you (again), APSDaemon.exe started chewing up CPU again and I had forgotten about this fix.

    Process Explorer was showing this task connecting to and utilising no disk, little network bandwidth, but nearly 100% CPU!

    After re-finding your solution all is well again (I think the issue re-appeared because I just upgraded iTunes)

    Thank You

  53. Worked for me too. At least for now before I update iTunes again…
    Windows 7 – 64 bit OS

  54. WOW, this work very very well! iTunes has never worked as fast as it does now after resetting the winsock!
    Windows 7 – 64 bit OS
    Thanx a lot!

  55. Thanks it works! My problems started when I installed CyberPatrol – content filtering. It seems Cyberpatrol is doing something to the winsock catalog. Only thing Cyberpatrol does not filter anymore. I can reproduce the error by re-installing Cyberpatrol.

  56. I have looked at these posts with hope but ran this and it didn’t seem to work. I have a windows 7 64. I must have done something wrong but have followed the simple steps but it hasn’t resolved. Anything obvious I could have missed!

  57. Thank you so much. It worked for me!

    Windows 7 64-bit OS
    Intel i5-2520M CPU
    4GB RAM

    It was taking up to 70% of my CPU’s capacity. Never seen it run that hot.

    Thanks again.

  58. I noticed this issue when my laptop was getting hot to touch and the fan struggled to cool it. What worked for me was un-installing all Apple software. Normal service was resumed!

  59. Hey, I am a bit hesitant to try anything in command prompt, for I’ve had bad experiences in the past. What does “netsh winsock reset” actually do? I’d like to know which parts of the computer it affects and what it resets. Furthermore, I’ve got a vista and itunes 10.6 and am wondering whether it should still work for these. A reply would be muchly appreciated.
    Thanks heaps.

  60. hi bandabat – basically itunes is clashing with something that’s monitoring your network stack, it could be legitimate software (eg anti virus) or might be something more unpleasant. the reset will remove the hooks from the network stack, which means itunes should work – although it may impact on what ever had its hooks removed.

    can read more about it here and here

    the commands for a reset on Vista are slightly different to those on XP so proceed with caution – and find out what’s hooked in first, you may need to check its still working and/or reinstall it afterwards.

  61. As per the above, in Vista, it’s worth first just running a basic ‘diagnose and repair’ in the ‘Network and Sharing Center’.

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