Correct. You cannot simulate that level of fidelity in realtime using win/linux/Qt. You would need to drastically lower your iterative frequency and maybe interpolate intermediate values. Otherwise, Do as I mention and use a synthetic timer that has no ties to realtime. As a safety margin on generic desktop systems don't do timers or trigger timed events at periods less than about 50ms (or 20hz). That broadly covers lower HZ values and "usually" handles scheduler noise. Remember that the Qt timers are more for UI responsiveness than tracking high precision events.