void LimitFrameRate(double targetFps) {
    static LARGE_INTEGER freq, lastTime;
    static bool init = false;
    if (!init) { QueryPerformanceFrequency(&freq); QueryPerformanceCounter(&lastTime); init = true; }
    
    double targetDelta = 1.0 / targetFps;
    LARGE_INTEGER currentTime;
    QueryPerformanceCounter(&currentTime);
    
    double elapsed = (double)(currentTime.QuadPart - lastTime.QuadPart) / freq.QuadPart;
    while (elapsed < targetDelta) {
        if (targetDelta - elapsed > 0.002) {
            Sleep(1); // Coarse sleep to yield CPU
        } else {
            YieldProcessor(); // Fine spinwait for last 2ms
        }
        QueryPerformanceCounter(&currentTime);
        elapsed = (double)(currentTime.QuadPart - lastTime.QuadPart) / freq.QuadPart;
    }
    lastTime = currentTime;
}