Processor DPC time is the time that a single processor spent receiving and servicing deferred procedure calls (DPCs). DPCs are interrupts that run at a lower priority than standard interrupts. `% DPC Time` is a component of `% Privileged Time` because DPCs are executed in privileged mode. If a high `% DPC Time` is sustained, there may be a processor bottleneck or an application or hardware related issue that can significantly diminish overall system performance.