If you've never heard of DPC Latency, you're probably suffering from it without knowing. It's one of the most underestimated causes of micro-stutters, random freezes, and input lag on gaming PCs — and it has nothing to do with hardware specs.
What is DPC Latency?
DPC stands for Deferred Procedure Call. It's a Windows mechanism through which hardware drivers (network card, sound card, USB, GPU) request CPU attention to process urgent data.
The problem: when a driver has a very long DPC (high latency), it interrupts the CPU for milliseconds. For games that need continuous, predictable processing, this interruption shows up as a micro-stutter — that quick freeze you can barely see but clearly feel.
How to identify if you have high DPC Latency
The free tool LatencyMon monitors your system's DPC latencies. To use it:
- Download LatencyMon (free)
- Launch it and click Play
- Use your PC normally for 5-10 minutes
- Check the results: any DPC above 1000µs (1ms) is problematic for gaming
- The "Drivers" tab shows which driver is causing the high latency
The most common culprits:
ndis.sys— network driver (very common)storport.sys— storage controllerdxgkrnl.sys— GPU driverusbxhci.sys— USB controllerHDAudBus.sys— audio driver
How to reduce DPC Latency
Update or roll back problematic drivers
If LatencyMon points to a specific driver, try updating it. If the issue appeared after an update, roll back to the previous version.
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Disable the Realtek audio driver/audio enhancer
The Realtek audio driver is one of the biggest causes of DPC Latency. If you use a USB headset or an external sound card, you can disable the onboard audio in the BIOS and in Device Manager.
Configure the network card
In the network card's advanced properties, disable features like "Interrupt Moderation", "Flow Control", and "Green Ethernet". These features were designed for energy savings, not for gaming.
Disable C-States in the BIOS
C-States are CPU power-saving states. When active, the CPU can "fall asleep" between tasks and take time to wake up. For gaming, disable C-States in the BIOS to keep the CPU always responsive.
Why this is hard to do on your own
Identifying and fixing DPC Latency requires specific tools, driver knowledge, and willingness to tweak the BIOS and Windows registry. A mistake can cause system instability.
UPBOOST has a systematic process for identifying and eliminating DPC Latency on any PC configuration. In 20 minutes, your stutters are gone — 15-day guarantee.
Frequently asked questions
Download LatencyMon (free) and run it for 5-10 minutes while using your PC normally. If it shows spikes above 1000µs (1ms), you have problematic DPC Latency. The "Drivers" tab shows which driver is causing it.