DPC latency
Also searched as: dpc latency · dpc · deferred procedure call · latencymon
What it means
A measure of how long a driver makes the system wait while it handles a hardware event. When one driver hogs that time, you get audio crackles and stutter that no FPS number explains.
More detail
DPC stands for Deferred Procedure Call — work a driver queues up to do shortly after a hardware interrupt. A single badly-behaved driver (often network, audio, or USB) can spike it and ruin smoothness on an otherwise strong PC. …
In the Blackbook
The deeper explanation continues inside the app. The Blackbook publishes its verdicts here — the full write-ups stay in the book, on your rig, next to your own measurements.
The Compy Blackbook holds 191 graded entries like this one, judged against your hardware — and every change it does make is reversible, with the receipt to prove it.
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