// Set thread & process priority to HIGH

    LARGE_INTEGER frequency, counter, cycle;
    QueryPerformanceFrequency(&frequency);
    QueryPerformanceCounter(&counter);

    counter.QuadPart += frequency.QuadPart;
    cycle.QuadPart = __rdtsc();

    do
    {
        QueryPerformanceCounter(&counter);
    } while(frequency.QuadPart >= counter.QuadPart);

    cycle.QuadPart -= __rdtsc();
    cycle.QuadPart /= 1000000; // Convert to MHz, 10^6

    // Reset process & thread priority