I suspect that everything on the RPI4 is slower than on the MBAir. I use a QHYCCD QHY5-III-178C for my guide camera and use it do PA on my RPI4 4GB with Astroberry. You have Update PA Error checked which can be very compute intensive so the recommendation I have seen is to use 2x2 binning to reduce the image size. Looks like your camera may be 9M pixels while mine is 6M pixels. I use 2x2 binning with the Update PA Error checked at a 0.5 second refresh and it is usable. Not amazing but usable.

Read More...