Takes a minute to expose and download each autofocus point. I have it setup to do a 2 second exposure at 1600. Perhaps it’s ignoring that setting?
This doesn’t seem all together too odd. Each image is 21 megapixels. The transfer time alone (on a lot of machines is around 30-45 seconds). After this, it might need to go through a software binning transform to prep it for auto focus and then finally, it needs to run a whole-image HFR scan. All of this can masquerade as download time, but if you don’t have a super fast machine doing all this, the process can overwhelm mediocre machines pretty quickly.