Great topic to dig into. The NVIDIA side of the DPC latency equation is usually the bigger offender than the kernel itself, and it’s almost always tied to the nvlddmkm.sys driver rather than some fundamental Windows design flaw. What I’ve seen repeatedly in competitive titles is that the driver’s hardware acceleration and GPU scheduling threads spike DPC times when the renderer hands off frames too aggressively—especially with features like Reflex competing with background telemetry and the new GPU scheduler in Win11. The trick is isolating the culprit with LatencyMon: run a sustained 10-15 minute session at in-game load, then sort by “Highest DPC routine.” If nvlddmkm or ndis.sys (your NIC driver) is topping the chart, that’s your bottleneck, not the kernel. Historically, disabling NVIDIA’s hardware-accelerated GPU scheduling and rolling back to a slightly older, more stable driver build often drops peak DPC times from 200ms+ down into the sub-50ms range that actually matters for competitive feel.
On the kernel and platform side, the wins come from eliminating idle-state thrashing and interrupt contention. Force your CPU out of deep C-states via a proper power plan (high performance, and critically set processor C-state minimum to 0), because wake latency from C6/C7 is one of the most common invisible DPC spikes.
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