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uTorrent severely lags computer, CPU 100% (Logs included)


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Ok, I've been browsing on many different forums about this problem. About 1 minute after I load uTorrent, my mouse will begin to lag and every process on my computer will begin to drastically slow down to a point where I can barely use my computer.. If I close uTorrent the problem goes away. My cpu usage is constantly spiking to 100%. I've tried deleting uTorrent + %AppData% directory, I've tried uninstalling all anti virus software as well as Malwarebytes, I've tried downgrading to an older version of uTorrent. Nothing seems to work. All of my info is below. Please let me know if anyone has had a similar issues with a fix. Thanks.

Process Explorer:




Logfile of Trend Micro HijackThis v2.0.3 (BETA)

Scan saved at 2:01:37 PM, on 5/1/2010

Platform: Unknown Windows (WinNT 6.01.3504)

MSIE: Internet Explorer v8.00 (8.00.7600.16385)

Boot mode: Normal

Running processes:




C:\Program Files\Mediafour\MacDrive 8\MacDrive.exe

C:\Program Files\DivX\DivX Update\DivXUpdate.exe

C:\Program Files\RAMRush\RAMRush.exe

C:\Program Files\Gizmo5\Gizmo5.exe


C:\Program Files\uTorrent\uTorrent.exe

C:\Program Files\Putty\putty.exe


C:\Program Files\Mozilla Firefox\firefox.exe

C:\Program Files\Fusion8Design\Cropper\Cropper.exe

C:\Program Files\WinRAR\WinRAR.exe


C:\Program Files\TrendMicro\HiJackThis\HiJackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157

R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157

R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896

R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896

R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157

R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =

R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =

R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyServer = http=

R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = *.local

R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =

O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll

O2 - BHO: URLRedirectionBHO - {B4F3A835-0E21-4959-BA22-42B3008E02FF} - C:\PROGRA~1\MICROS~4\Office14\URLREDIR.DLL

O4 - HKLM\..\Run: [MacDrive 8 application] "C:\Program Files\Mediafour\MacDrive 8\MacDrive.exe"

O4 - HKLM\..\Run: [DivXUpdate] "C:\Program Files\DivX\DivX Update\DivXUpdate.exe" /CHECKNOW

O4 - HKCU\..\Run: [ftweak_RAMRush] C:\Program Files\RAMRush\RAMRush.exe

O4 - HKCU\..\Run: [Gizmo5] "C:\Program Files\Gizmo5\Gizmo5.exe"

O4 - HKUS\S-1-5-19\..\Run: [sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User 'LOCAL SERVICE')

O4 - HKUS\S-1-5-19\..\RunOnce: [mctadmin] C:\Windows\System32\mctadmin.exe (User 'LOCAL SERVICE')

O4 - HKUS\S-1-5-20\..\Run: [sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User 'NETWORK SERVICE')

O4 - HKUS\S-1-5-20\..\RunOnce: [mctadmin] C:\Windows\System32\mctadmin.exe (User 'NETWORK SERVICE')

O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://fpdownload2.macromedia.com/get/shockwave/cabs/flash/swflash.cab

O17 - HKLM\System\CCS\Services\Tcpip\..\{630F5930-5473-4139-9582-7BED0C7D5289}: NameServer =

O18 - Filter hijack: text/xml - {807573E5-5146-11D5-A672-00B0D022E945} - C:\Program Files\Common Files\Microsoft Shared\OFFICE14\MSOXMLMF.DLL

O23 - Service: Apple Mobile Device - Apple Inc. - C:\Program Files\Common Files\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe

O23 - Service: Bonjour Service - Apple Inc. - C:\Program Files\Bonjour\mDNSResponder.exe

O23 - Service: DynDNS Updater - Dynamic Network Services, Inc. - C:\Program Files\DynDNS Updater\DynUpSvc.exe

O23 - Service: HDD Information Service (HDDSvc) - AltrixSoft (http://www.altrixsoft.com/) - C:\Program Files\Common Files\AltrixSoft\HDDInfoService\HDDSvc.exe

O23 - Service: Intuit Update Service (IntuitUpdateService) - Intuit Inc. - C:\Program Files\Common Files\Intuit\Update Service\IntuitUpdateService.exe

O23 - Service: iPod Service - Apple Inc. - C:\Program Files\iPod\bin\iPodService.exe

O23 - Service: Media Center Support Service (Jasmio.MediaCenter.Service) - Unknown owner - C:\Program Files\Jasmio\Media Center Support Service\Jasmio.MediaCenter.Service.exe

O23 - Service: MacDrive service (MacDriveService) - Mediafour Corporation - C:\Program Files\Mediafour\MacDrive 8\MacDriveService.exe

O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\Windows\system32\nvsvc32.exe

O23 - Service: PC Tools Startup and Shutdown Monitor service (PCToolsSSDMonitorSvc) - Unknown owner - C:\Program Files\Common Files\PC Tools\sMonitor\StartManSvc.exe


Process Explorer Log:

Process: uTorrent.exe Pid: 352

Name Description Company Name Version




actxprxy.dll ActiveX Interface Marshaling Library Microsoft Corporation 6.1.7600.16385

ADVAPI32.dll Advanced Windows 32 Base API Microsoft Corporation 6.1.7600.16385

apphelp.dll Application Compatibility Client Library Microsoft Corporation 6.1.7600.16481

ATL.DLL ATL Module for Windows XP (Unicode) Microsoft Corporation 3.5.2284.0

AUTHZ.dll Authorization Framework Microsoft Corporation 6.1.7600.16385

CFGMGR32.dll Configuration Manager DLL Microsoft Corporation 6.1.7600.16385

CLBCatQ.DLL COM+ Configuration Catalog Microsoft Corporation 2001.12.8530.16385

COMCTL32.dll User Experience Controls Library Microsoft Corporation 6.10.7600.16385

comctl32.dll.mui User Experience Controls Library Microsoft Corporation 6.10.7600.16385

comdlg32.dll Common Dialogs DLL Microsoft Corporation 6.1.7600.16385

credssp.dll Credential Delegation Security Package Microsoft Corporation 6.1.7600.16385

CRYPT32.dll Crypto API32 Microsoft Corporation 6.1.7600.16385

CRYPTBASE.dll Base cryptographic API DLL Microsoft Corporation 6.1.7600.16385

CRYPTSP.dll Cryptographic Service Provider API Microsoft Corporation 6.1.7600.16385

CSCAPI.dll Offline Files Win32 API Microsoft Corporation 6.1.7600.16385

CSCDLL.dll Offline Files Temporary Shim Microsoft Corporation 6.1.7600.16385

cscui.dll Client Side Caching UI Microsoft Corporation 6.1.7600.16385




DEVOBJ.dll Device Information Set DLL Microsoft Corporation 6.1.7600.16385

dhcpcsvc.DLL DHCP Client Service Microsoft Corporation 6.1.7600.16385

dhcpcsvc6.DLL DHCPv6 Client Microsoft Corporation 6.1.7600.16385

DnsApi.dll DNS Client API DLL Microsoft Corporation 6.1.7600.16385

DUser.dll Windows DirectUser Engine Microsoft Corporation 6.1.7600.16385

duser.dll.mui Windows DirectUser Engine Microsoft Corporation 6.1.7600.16385

dwmapi.dll Microsoft Desktop Window Manager API Microsoft Corporation 6.1.7600.16385

EhStorShell.dll Windows Enhanced Storage Shell Extension DLL Microsoft Corporation 6.1.7600.16385

FirewallAPI.dll Windows Firewall API Microsoft Corporation 6.1.7600.16385

fwpuclnt.dll FWP/IPsec User-Mode API Microsoft Corporation 6.1.7600.16385

GDI32.dll GDI Client DLL Microsoft Corporation 6.1.7600.16385

GPAPI.dll Group Policy Client API Microsoft Corporation 6.1.7600.16385

hnetcfg.dll Home Networking Configuration Manager Microsoft Corporation 6.1.7600.16385

ieframe.dll Internet Browser Microsoft Corporation 8.0.7600.16490

iertutil.dll Run time utility for Internet Explorer Microsoft Corporation 8.0.7600.16385

IMM32.DLL Multi-User Windows IMM32 API Client DLL Microsoft Corporation 6.1.7600.16385

Iphlpapi.dll IP Helper API Microsoft Corporation 6.1.7600.16385

kernel32.dll Windows NT BASE API Client DLL Microsoft Corporation 6.1.7600.16481

KERNELBASE.dll Windows NT BASE API Client DLL Microsoft Corporation 6.1.7600.16385

KernelBase.dll.mui Windows NT BASE API Client DLL Microsoft Corporation 6.1.7600.16385


LPK.dll Language Pack Microsoft Corporation 6.1.7600.16385

MACDRAPI.DLL MacDrive API Mediafour Corporation

mdnsNSP.dll Bonjour Namespace Provider Apple Inc.

MDVolumeIcons.dll MDVolumeIcons.dll Mediafour Corporation

MSASN1.dll ASN.1 Runtime APIs Microsoft Corporation 6.1.7600.16415

MSCTF.dll MSCTF Server DLL Microsoft Corporation 6.1.7600.16385

msvcrt.dll Windows NT CRT DLL Microsoft Corporation 7.0.7600.16385

mswsock.dll Microsoft Windows Sockets 2.0 Service Provider Microsoft Corporation 6.1.7600.16385

msxml3.dll MSXML 3.0 SP11 Microsoft Corporation 8.110.7600.16385

msxml3r.dll XML Resources Microsoft Corporation 8.110.7600.16385

netshell.dll Network Connections Shell Microsoft Corporation 6.1.7600.16385

netutils.dll Net Win32 API Helpers DLL Microsoft Corporation 6.1.7600.16385

nlaapi.dll Network Location Awareness 2 Microsoft Corporation 6.1.7600.16385

npmproxy.dll Network List Manager Proxy Microsoft Corporation 6.1.7600.16385

NSI.dll NSI User-mode interface DLL Microsoft Corporation 6.1.7600.16385

ntdll.dll NT Layer DLL Microsoft Corporation 6.1.7600.16385

ntmarta.dll Windows NT MARTA provider Microsoft Corporation 6.1.7600.16385

ntshrui.dll Shell extensions for sharing Microsoft Corporation 6.1.7600.16385

ole32.dll Microsoft OLE for Windows Microsoft Corporation 6.1.7600.16385

OLEACC.dll Active Accessibility Core Component Microsoft Corporation

oleaccrc.dll Active Accessibility Resource DLL Microsoft Corporation

oleaut32.dll Microsoft Corporation 6.1.7600.16385

peerdist.dll BranchCache Client Library Microsoft Corporation 6.1.7600.16385

profapi.dll User Profile Basic API Microsoft Corporation 6.1.7600.16385

PROPSYS.dll Microsoft Property System Microsoft Corporation 7.0.7600.16385

PSAPI.DLL Process Status Helper Microsoft Corporation 6.1.7600.16385

rasadhlp.dll Remote Access AutoDial Helper Microsoft Corporation 6.1.7600.16385

RPCRT4.dll Remote Procedure Call Runtime Microsoft Corporation 6.1.7600.16385

RpcRtRemote.dll Remote RPC Extension Microsoft Corporation 6.1.7600.16385

rsaenh.dll Microsoft Enhanced Cryptographic Provider Microsoft Corporation 6.1.7600.16385

sechost.dll Host for SCM/SDDL/LSA Lookup APIs Microsoft Corporation 6.1.7600.16385

SETUPAPI.dll Windows Setup API Microsoft Corporation 6.1.7600.16385

SHELL32.dll Windows Shell Common Dll Microsoft Corporation 6.1.7600.16385

shfolder.dll Shell Folder Service Microsoft Corporation 6.1.7600.16385

SHLWAPI.dll Shell Light-weight Utility Library Microsoft Corporation 6.1.7600.16385

slc.dll Software Licensing Client Dll Microsoft Corporation 6.1.7600.16385


srvcli.dll Server Service Client DLL Microsoft Corporation 6.1.7600.16385

SSDPAPI.dll SSDP Client API DLL Microsoft Corporation 6.1.7600.16385

SspiCli.dll Security Support Provider Interface Microsoft Corporation 6.1.7600.16385


SXS.DLL Fusion 2.5 Microsoft Corporation 6.1.7600.16385

tiptsf.dll Tablet PC Input Panel Text Services Framework Microsoft Corporation 6.1.7600.16385

upnp.dll UPnP Control Point API Microsoft Corporation 6.1.7600.16385

urlmon.dll OLE32 Extensions for Win32 Microsoft Corporation 8.0.7600.16490

USER32.dll Multi-User Windows USER API Client DLL Microsoft Corporation 6.1.7600.16385

USERENV.dll Userenv Microsoft Corporation 6.1.7600.16385

USP10.dll Uniscribe Unicode script processor Microsoft Corporation 1.626.7600.16385

uTorrent.exe µTorrent BitTorrent, Inc.

uxtheme.dll Microsoft UxTheme Library Microsoft Corporation 6.1.7600.16385

VERSION.dll Version Checking and File Installation Libraries Microsoft Corporation 6.1.7600.16385

webio.dll Web Transfer Protocols API Microsoft Corporation 6.1.7600.16385

WindowsCodecs.dll Microsoft Windows Codecs Library Microsoft Corporation 6.1.7600.16385

WINHTTP.dll Windows HTTP Services Microsoft Corporation 6.1.7600.16385

WINNSI.DLL Network Store Information RPC interface Microsoft Corporation 6.1.7600.16385

wkscli.dll Workstation Service Client DLL Microsoft Corporation 6.1.7600.16385

WLDAP32.dll Win32 LDAP API DLL Microsoft Corporation 6.1.7600.16385

WS2_32.dll Windows Socket 2.0 32-Bit DLL Microsoft Corporation 6.1.7600.16385

wship6.dll Winsock2 Helper DLL (TL/IPv6) Microsoft Corporation 6.1.7600.16385

wshtcpip.dll Winsock2 Helper DLL (TL/IPv4) Microsoft Corporation 6.1.7600.16385


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Seems like your post worked for a few people, unfortunately not for me. :( I tried your settings exactly, and it still lags. I'm out of options.. I'm gonna have to kick uTorrent which is something I absolutely did not want to do. Thanks for your help anyway.

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Holy crap, your drivers are using a ton of CPU. It's hard to debug that on Vista/7, since RATTV3 no longer works on 64bit systems...

Are you using wireless? USB networking? USB HDD? Anything else of note? RAID?

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I'm using a direct connection to my ethernet port from a wireless bridge (Linksys WRT54G DDWRT fw)..No wireless PCI cards, No USB HDD's or network cards.

Edit: So, you mentioning the drivers got me to try something.. I disabled my AGP Graphics card and rebooted.. No more lag while running uTorrent. Only problem now is I can't use the graphics card. Not a big deal, not my primary PC. Thanks for the help.

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i have being haveing the same problem with utorrent freezeing and takeing loads of cpu with the mouse moveing slow i even updated to windows 7 from vista and after a few days it starts lagging again i downgraded utorrent and still same problem it used to work but since i updated to a few week back it started to lag

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Ok wild guess here :D But is your HDD DMA enabled ? this was a common problem long ago thus on old(er) hardware (but WinXP too) :) and Windows can turn DMA off if it detects some sort of HDD problems (not just bad sectors I guess)

I know it's silly of me to assume it isn't enabled, but may be worth a check.

You can look in Device Manager -> IDE/ATA?ATAPI controllers ATA Channel 0 (and 1 afterwards) -> Advanced Settings, and should say something like Ultra DMA Mode 5 or something other than PIO (I guess PIO (programmed I/O ?) which is aka DMA off). This might differ depending on your windows and I don't know how it works for SATA HDDs that aren't seen as IDE or something... Maybe you can use other information programs to get this DMA info.

But if you have small internet speed (thus not much read/write going on) and if DMA off for HDDs then you shouldn't have that much CPU usage :)

Maybe there are other DMAs to check too, ie. network card DMA is it on? (I guess in win7 this cmd:

netsh int tcp show global

will give you something like NetDMA State : enabled

if it's on)

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Thanks for all the input. After disabling uPnP & NAT-PMP the problem completely vanished. After hitting 'apply' I watched the cpu usage fall to nearly 5%. I'm stumped on why that is, but I can tell you it worked. 2 days and the problem hasn't been back. Thanks to everyone who responded.

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Hello everyone, Jen.L, newly registered user here [ no kidding, registered @ 10/may/2010 ]

Anyways, i ought to give my input into this issue of 100% cpu usage

Some computer specs :

- Dell Studio 1555, ATI 4650 card. ( But don't think any more is necessary as i address later )

- Windows 7 Ultimate. ( Highly tuned from viper's windows 7 services )

Now on to the nitty gritty detail and why i felt obliged to register and post this.

I've noticed that I get reproduce exact 100% cpu usage just be doing the following.

: Opening safari 4.05 for windows.

followed by utorrent ( build is 2,01 19248 )

Apparently, there is either a bug on Utorrent's or Safari 4's

And i've a hunch, that its Safari 4's blazing javascript engine, Nitro, thats the cluprit.

But this is entirely based on my own system findings. Anyone able to verify using XP, vista and then Windows 7?

( No VMware please, for AFAIK, certain drivers ain't loaded)

Cheers =D

[ After some trying ]

Looks like i'm still able to reproduce such issue of 100% cpu usage.

But heres the interesting aspect to this huge joke.

If i've opened Utorrent first, before opening safari 4, everything would load normal

Yes, you've read it right, theres a certain order into making such a issue.

Thus, Open utorrent first----> then open Safari 4 = no problems

But, Open Safari 4 first ----> then open Utorroent = 100% cpu usage.

P.S I've tried the above "remedies" for cpu 100% usage after reproducing this problem, doesn't work. That includes unchecking UPnP and NAT port mapping.

Hope my post can provide some useful information

Cheers Yet again lmao.

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@rafi : Guess i need to stand corrected for some misinformation.

After testing several times ( before trying your solution), i found it not as simple as to reproduce the symptoms as i've mentioned. Apparently, its only if the conditions are met :

2 safari 4 windows opened ( Alt+I, then Alt + O which open last closed windows) with 5 tabs or more....sometimes 2 tabs...... :/

and its not even funny how even after testing several times, 3 its locks as mentiones and close everything and then it works....( not tempering of settings on anything whatsoever)

Guess it how windows 7 is engineered

But really thanks about the reply,i did went through the solution, and stated it didn't work. So i might be a memory leak or something from safari 4......

just plain weird : /

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