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Windows 7: High DPC Latency No Stuttering

26 Feb 2015   #1

Windows 7 Ultimate x64
High DPC Latency No Stuttering

Recently I had some High DPC Latency which I believe was the cause of some sound stuttering. I believed it was my headset but when my new headset, Sennheiser PC363D, came in I had the same problem. At the time I was unaware of what DPC Latency was and just thought my old headset was dying. When I used my new headset I experienced the same stutter in sound. I never once experienced any stutter in sound when I use my TV, I use a TV as a monitor.

I ended up switching USB ports a couple times and found that I no longer had any sound stutter but I was still experiencing High DPC Latency.

If I am playing music through youtube and teamspeak I experience on average 550 DPC Latency.

If I turn on OBS to stream I experience around 600-700 DPC Latency

If I turn on Steam to play games I experience about 12000+ DPC Latency

Now I know none of this is normal because my friends are running all of this on computers that are not as strong as mine and are averaging 50 DPC Latency, 130 DPC Latency, and 80 DPC Latency.

I tried doing this guide How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8) - Sysnative Forums but I was getting stuck on this part xperf -d %userprofile%\Desktop\trace.etl

I was wondering if anyone would be able to help me lower my DPC Latency or give me an explanation why mine is so much higher than my friends who rigs are not as good as mine.

Either way thanks for the help ahead of time! As a note I am not extremely tech savvy but I have diagnosed most of this on my own or with the help of the guide.

My System SpecsSystem Spec
01 Mar 2015   #2

Windows 7 Ultimate x64

I am assuming you are using Windows 7 Ultimate.

1. Forget about "xperf -d %userprofile%\Desktop\trace.etl". That is part of a toolkit for Windows 8. The only reason they suggest using it, is that LatencyMon is not compatible with Windows 8.

2. Download and install LatencyMon from Resplendence Software - Advanced System Tools and Developer Components

3. Download DPC Latency Checker from DPC Latency Checker

4. Run DPC Latency Checker. Note if you are still having high latency.

5. If you area experiencing high latency, run LatencyMon. From there look at the Processes tab and Drivers tab and see which processes and drivers are causing the most amount of latency. If it is a process causing the issue, try ending the process to see if things improve. If it is a driver, try updating the driver.

6. If you need to disable prevent a driver or process from running at startup, download and install Autoruns from Autoruns Download Be sure to run as administrator and be sure you know what you are disabling before you do so. To disable something from startup, just uncheck the box next to the item (do not delete it!).

7. If you suspect a virus or malware, post your problem in Windows 7 Forum - Bleeping Computer is very reliable and would be a great place to help you with such things.

Notes: If it is specifically the USB driver, also try unplugging everything from your USB ports to see if that helps. USB 2 generally has a higher contribution to DPC latency, so use USB 3 ports when available (even with low bandwidth devices, such as a mouse and keyboard). Note that any wireless devices tend to also contribute to DPC latency (i.e. wireless keyboard, wireless network card, etc...). If you are not using a wireless connection to connect to the internet, and you have such a device connected to the machine, try disabling your wireless adapter. Antivirus software could also cause issues; you can try temporarily disabling yours to see if it has an effect.

Either way, let me know how you make out. When it comes to DPC latency, it takes a bit of detective work. Just be glad you are not using Vista.
My System SpecsSystem Spec

 High DPC Latency No Stuttering

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