Hardware Bottlenecks
System\Context Switches/sec -measures how frequently the processor has to switch from user- to kernel-mode to handle a request from a thread running in user mode ; the heavier the workload running on your machine, the higher this counter will generally be, but over long term the value of this counter should remain fairly constant ;you should create a baseline and then create a Perfomance Monitor Alert for this counter.
Processor\Interrupts/sec (_Total) -if this counter with the above counter suddenly start increasing
it may be an indicating of a malfunctioning device ;over 40% you have a driver or hardware problem
Processor\Privileged Time (_Total) – if this counter increases too then you might have problemems with a device driver.
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