Why does my PC slow down when I plug in the network cable?

Jhon U March 12, 2014

My PC is getting slow when I plug the internet cable. Please help!

  1. Howard B
    March 20, 2014 at 9:15 pm

    It may be because your PC is infected with malware, which tries to use the Internet connection for things like infecting other PCs, batch sending SPAM, and DDOS attacks. Run a scan with MalwareBytes, and either Panda Cloud ActiveScan (http://PandaSecurity.com) or Trend Micro Housecall (http://housecall.trendmicro.com/), and install (and keep updated!) a decent antivirus; I recommend either the free versions of AVG, Avast!, or Avira.

  2. Oron J
    March 14, 2014 at 4:23 pm

    There are many possible reasons, but in essence, it is because you have network communication, which you wouldn't without the cable. Once you are on a network:

    • Your network drivers start to work, and other components of the OS may start to use communicate and use RAM & CPU power.
    • Any pending download operations will start to take place (see Dave P's comment)
    • If your computer is infected with a virus or other malware, it may start communicating with the outside world and use up computer resources for the purpose
    • A fault with the network card or cable could cause the network drivers or other components of the OS to time out, crash or otherwise misbehave. When this happens, it is impossible to predict what the specific symptoms will be, other than that the computer will work less well than usual...
  3. Hovsep A
    March 13, 2014 at 5:17 pm

    Check Dave P comment, do check task manager after plugging the cable to see which process/service is going high
    also maybe cable problem? try another one

    Windows 7 Stops Responding or Becomes Very Slow After Connecting to the Internet

  4. Dave P
    March 13, 2014 at 11:43 am

    This could be related to software trying to update all at once as soon as you plug your cable in. In which case the problem should go away after a while when they've all finished updating.

    Whether it is this or not the best thing to do is open the Windows Resource Monitor and see what is using the most resources. You can then end those programs or Google the names to see whether you need them running or not.


  5. Dalsan M
    March 13, 2014 at 12:08 am

    Could you give us information about your computer, especially the network card being used and operating system?

    Sometimes Windows Update installs the wrong driver for the network card, especially on older Intel Pro network cards that are used in Windows 7 and above. Try installing the driver from the manufacturer's website and see if it helps. Also, check to see if the hard drive activity is high when the network cable is plugged in.

    There could be cloud services, such as Google Music or other service that uploads content to the cloud, that is taking up intent bandwidth and causes the hard drive to constantly run high activity.

    You could see if another cable helps as sometimes a bad cable can cause these issues. It could also be the SSDP Discovery Service or similar service running in the background. You can try to disable it to see if it helps. http://www.blackviper.com/windows-services/ssdp-discovery-service/

    There are many people that mention this issue, but very few resolutions are mentioned. Let us know if these do or do not work and we will try to give more possible solutions.

  6. RAID Data Recovery
    March 12, 2014 at 12:24 pm

    Basically its the problem about your RAM,please remove and buy a good quality and high speed RAM,then its going to be OK.

    • Jhon U
      March 13, 2014 at 3:27 am

      are you sure because if i unplug the cable it fast again

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