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High-Precision Timers in Windows: QueryPerformanceCounter vs GetSystemTimePreciseAsFileTime

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2y ago · Jul 4, 2024 7:51 PM

QueryPerformanceCounter (QPC) reads the hardware TSC (Time Stamp Counter) via ACPI/HPET with sub-microsecond precision.

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2y ago · Jul 4, 2024 11:07 PM

GetSystemTimePreciseAsFileTime provides high-precision synchronized UTC clock time for network timestamping.

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2y ago · Jul 5, 2024 5:07 AM

QPC is monotonic and immune to NTP system clock adjustments, making it the only choice for game loop delta time.

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