def METHOD_NAME(self):
    if self._to_stop:
        return
    time_since_last_update = time.time() - self._last_update_time
    self._last_update_time = time.time()
    # Since we don't know how much time actually passed, check how many intervals of 50 we had.
    self._loading_image_rotation_angle -= 10 * (time_since_last_update * 1000 / 50)
    self.repaint()