code: func (m *Monitor) RefreshRate() (rate float64) {
  	var mode *glfw.VidMode
  	mainthread.Call(func() {
  		mode = m.monitor.GetVideoMode()
  	})
  	rate = float64(mode.RefreshRate)
  	return
  }
docs: // RefreshRate returns the refresh frequency of the Monitor in Hz (refreshes/second).