DPC Latency Caused by TCP/IP.SYS: How to Fix It in 5 Steps

You can try flushing the DNS cache or changing the power plan

by Sagar Naresh
Sagar Naresh
Sagar Naresh
Content Analyst
Sagar is a web developer and technology journalist. Currently associated with WindowsReport and SamMobile. When not writing, he is either at the gym sweating it out or playing... read more
Reviewed by Alex Serban
Alex Serban
Alex Serban
Windows Server & Networking Expert
After moving away from the corporate work-style, Alex has found rewards in a lifestyle of constant analysis, team coordination and pestering his colleagues. Holding an MCSA Windows Server... read more
Affiliate Disclosure
  • The tcpip.sys DCP latency issue is pretty frustrating as it could result in cracking sounds or BSOD errors.
  • Several users have reported that updating the network driver has helped them resolve the error.
  • You can also try out turning off the Energy Efficient Ethernet option and apply other solutions as well.

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DPC stands for Deferred Procedure Call and is meant to perform high-priority tasks first and low-priority tasks later. However, tcpip.sys latency issues can sometimes interfere with DPC.

TCP/IP or Transmission Control Protocol/Internet Protocol handles the communication between PCs. If the tcp/ip.sys goes corrupt then it will misbehave and often lead to BSOD errors. Thankfully in this guide, we have a bunch of solutions that will help you to resolve the tcp/ip.sys latency issue in your PC.

What can cause DPC latency?

There are several common causes for DPC latency, with the following ones being the most common:

  • Outdated drivers – Outdated drivers can cause this and many other issues. To fix it, just update your drivers and the issue should be gone.
  • DNS cache – DNS cache can sometimes cause problems with your network adapter, but you simply need to flush DNS to fix that.
  • Power settings – Adjusting the power plan or network adapter settings can sometimes fix this problem.
  • IPv6 – This is a fairly new protocol and it can cause issues with certain network adapter drivers.

How can I fix tcpip.sys latency?

1. Flush the DNS cache

  1. Open the Start menu.
  2. Run the command prompt as an administrator.
  3. Type the below commands and press Enter, one by one. netsh winsock reset
    netsh int ip reset
    ipconfig /release
    ipconfig /renew
    ipconfig /flushdns
  4. Restart your computer and check if this resolves the issue or not.

One of the ways to fix the DCP latency issue caused by tcpip.sys is to flush the DNS cache. Running a bunch of commands removes the IP addresses or other DNS records from the cache.

2. Change the current power plan

  1. Open the Start menu by pressing the Windows button.
  2. Open the Control Panel.
  3. Click on Power Options.
  4. Select a different power plan except for the Balanced option.

Several users have reported that switching from the Balanced power plan to a high-performance or other power plan helped them resolve the tcpip.sys latency.

3. Update the network driver

  1. Right-click on the Start menu and select Device Manager.
  2. Expand the Network adapters.
  3. Right-click on your network adapter and select Update driver from the context menu.
  4. Hit the Search automatically for drivers option.
  5. Let the system look out for a new driver for your network and follow the prompts if it detects one.

Chances are the outdated network drivers are causing the tcpip.sys latency issue on your PC. Update the driver by following the above steps and check if this resolves the issue or not.

Expert tip:


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Another simple and fast solution to keep your drivers updated and avoid future errors is to use an automated driver update tool.

Some of the most common Windows errors and bugs are a result of old or incompatible drivers. The lack of an up-to-date system can lead to lag, system errors or even BSoDs.
To avoid these types of problems, you can use an automatic tool that will find, download, and install the right driver version on your Windows PC in just a couple of clicks, and we strongly recommend DriverFix. Here’s how to do it:

  1. Download and install DriverFix.
  2. Launch the application.
  3. Wait for DriverFix to detect all your faulty drivers.
  4. The software will now show you all the drivers that have issues, and you just need to select the ones you’d liked fixed.
  5. Wait for DriverFix to download and install the newest drivers.
  6. Restart your PC for the changes to take effect.


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4. Turn off the Energy Efficient Ethernet option

  1. Right-click on the Start menu and select Device Manager.
  2. Expand the Network adapters.
  3. Right-click on your network adapter and select Properties from the context menu.
  4. Switch to the Advanced tab.
  5. Click on the Energy Efficient Ethernet.
  6. From the Value drop-down menu, select Disabled.
  7. Click OK to apply the changes and check if this resolves the issue.

After doing that, check if tcpip.sys latency is gone.

5. Disable the IPv6

  1. Press the Win + R keys to open the Run dialogue.
  2. Type ncpa.cpl and hit Enter.
  3. Right-click on your internet and select Properties.
  4. Uncheck the box for Internet Protocol Version 6 entry.
  5. Click OK.
  6. Restart your PC and check if this resolves the issue or not.

There are chances that the internet protocol that you have selected is problematic. In such a case, you can simply disable the protocol and check if this resolves the issue or not.

In case you are facing an audio latency issue on your Windows PC, you can check out our guide which gives you a bunch of solutions to resolve the problem.

You can also refer to our guide which lists five effective solutions to resolve high ping, ping spikes, and latency issues on your Windows PC.

That is it from us in this guide. Let us know in the comments below, which one of the above solutions helped you resolve the tcpip.sys latency issue.

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If the advices above haven't solved your issue, your PC may experience deeper Windows problems. We recommend downloading this PC Repair tool (rated Great on TrustPilot.com) to easily address them. After installation, simply click the Start Scan button and then press on Repair All.

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