QGC update rate of PX4Flow image

Hi,
I am using PX4FLow optical flow camera in my quad. I was calibrating the focus and found that the image update rate is slow in both QGC and Mission Planner. As the sensor sends update rate at 250 Hz, what is the image update rate in QGC?

The problem: I am finding image quality fine but the readings are erroneous, hence I need some clarity over the image update rate in the GCS.

While not an ark product. @AlexKlimaj could possible steer you in the right direction.