Why are .NET timers limited to 15 ms resolution?

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Perhaps the document linked here explains it a bit. It’s kinda dry so I only browsed it quickly 🙂

Quoting the intro:

The system timer resolution determines
how frequently Windows performs two
main actions:

  • Update the timer tick
    count if a full tick has elapsed.
  • Check whether a scheduled timer object
    has expired.

A timer tick is a notion of elapsed
time that Windows uses to track the
time of day and thread quantum times.
By default, the clock interrupt and
timer tick are the same, but Windows
or an application can change the clock
interrupt period.

The default timer
resolution on Windows 7 is 15.6
milliseconds (ms). Some applications
reduce this to 1 ms, which reduces the
battery run time on mobile systems by
as much as 25 percent.

Originally from: Timers, Timer Resolution, and Development of Efficient Code (docx).

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