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Making Graphics, Windowing, and Events Subsystem (GWES) API calls in the thread that requires a real-time response can affect real-time performance negatively. GWES provides the functionality that is needed to display windows, draw objects, and enable notifications. However, this functionality has no guaranteed timeout. Because GWES utilizes a single critical section to protect access to its internal data structures, a thread can be blocked for an unbounded length of time waiting for another thread to complete an operation.
Using SetTimeras a real-time timer can also decrease performance. SetTimeris a timer that is based on Windows Mobile message queues and has no guarantee for signaling time.