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Context Switches/sec is the combined rate at which all processors on the computer are switched from one thread to another.
Context switches occur when a running thread voluntarily relinquishes the processor, is preempted by a higher priority ready thread, or switches between user-mode and privileged (kernel) mode to use an Executive or subsystem service.
It is the sum of Thread\\Context Switches/sec for all threads running on all processors in the computer and is measured in numbers of switches.
There are context switch counters on the System and Thread objects. This counter displays the difference between the values observed in the last two samples, divided by the duration of the sample interval.

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.

The Processor Information\% Interrupt Time is the time the processor spends receiving and servicing
hardware interrupts during sample intervals. This value is an indirect indicator of the activity of
devices that generate interrupts, such as the system clock, the mouse, disk drivers, data communication
lines, network interface cards and other peripheral devices. This is an easy way to identify a potential
hardware failure. This should never be higher than 20%.

The Processor Information\% Privileged Time counter shows the percent of time that the processor is spent
executing in Kernel (or Privileged) mode. Privileged mode includes services interrupts inside Interrupt
Service Routines (ISRs), executing Deferred Procedure Calls (DPCs), Device Driver calls and other kernel-mode
functions of the Windows® Operating System.

The Processor Queue Length shows the number of threads that are observed as delayed in the processor Ready Queue
and are waiting to be executed.

The Processor Information\% User Time counter shows the percent of time that the processor(s) is spent executing
in User mode.

The number of logical processors available on the computer.

Average disk read queue, the number of requests outstanding on the disk at the time the performance data is collected.

Average disk write queue, the number of requests outstanding on the disk at the time the performance data is collected.

Current average disk queue, the number of requests outstanding on the disk at the time the performance data is collected.

Rate of read operations on the disk.

The average time for read requests issued to the device to be served. This includes the time spent by the requests in queue and the time spent servicing them.

This item is the percentage of elapsed time that the selected disk drive was busy servicing read or writes requests.

Rate of write operations on the disk.

The average time for write requests issued to the device to be served. This includes the time spent by the requests in queue and the time spent servicing them.

Average disk read queue, the number of requests outstanding on the disk at the time the performance data is collected.

Average disk write queue, the number of requests outstanding on the disk at the time the performance data is collected.

Current average disk queue, the number of requests outstanding on the disk at the time the performance data is collected.

Rate of read operations on the disk.

The average time for read requests issued to the device to be served. This includes the time spent by the requests in queue and the time spent servicing them.

This item is the percentage of elapsed time that the selected disk drive was busy servicing read or writes requests.

Rate of write operations on the disk.

The average time for write requests issued to the device to be served. This includes the time spent by the requests in queue and the time spent servicing them.

Average disk read queue, the number of requests outstanding on the disk at the time the performance data is collected.

Average disk write queue, the number of requests outstanding on the disk at the time the performance data is collected.

Current average disk queue, the number of requests outstanding on the disk at the time the performance data is collected.

Rate of read operations on the disk.

The average time for read requests issued to the device to be served. This includes the time spent by the requests in queue and the time spent servicing them.

This item is the percentage of elapsed time that the selected disk drive was busy servicing read or writes requests.

Rate of write operations on the disk.

The average time for write requests issued to the device to be served. This includes the time spent by the requests in queue and the time spent servicing them.

Average disk read queue, the number of requests outstanding on the disk at the time the performance data is collected.

Average disk write queue, the number of requests outstanding on the disk at the time the performance data is collected.

Current average disk queue, the number of requests outstanding on the disk at the time the performance data is collected.

Rate of read operations on the disk.

The average time for read requests issued to the device to be served. This includes the time spent by the requests in queue and the time spent servicing them.

This item is the percentage of elapsed time that the selected disk drive was busy servicing read or writes requests.

Rate of write operations on the disk.

The average time for write requests issued to the device to be served. This includes the time spent by the requests in queue and the time spent servicing them.

Average disk read queue, the number of requests outstanding on the disk at the time the performance data is collected.