PowerShell timer/stopwatch accuracy

Question:

I find that the System.Diagnostics.Stopwatch class has what seems to be measurable inaccuracy, even over a short time period (i.e. 20 seconds). My process is showing an elapsed time of 20.3+ seconds for a process coded to run 20 seconds:

Is this kind of accuracy drift to be expected when using the Stopwatch class in PowerShell? It seems to increase disproportional to the time span (i.e. 10 seconds is off by 0.1 and 20 by 0.3). Is my code at fault?

Answer:

The question is, what are you trying to do? If you are trying to determine how long it takes a script to run, exactly, you should use the stopwatch. However, if you are trying to start a new sequence of commands after a specified period, use a [System.Timers.Timer] and register an event for the elapsed event on the timer object. Then specify the action of the registered event to what it you are trying to accomplish.

Source:

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