oneredpanther I shoot with an ASI6200MM and the FITS files are 128 Mb. The JPEGs are MUCH smaller. Still, when I am shooting, the previews on screen take several seconds at 20+ Mb/sec to download to my tablet.
In any case, when shooting bias, darks, dark flats or flats, I think downloading a preview is useless and that should be possible to disable.