Mmmm, interesting. So there's only a minor uplift from RPi4/8G to RPi5/8G.

I would say that there is something less than ideal going on with your ASI2600MC though. I run the same camera on a RPi4/8G and I see 120fps @ 400x400 in FireCapture and a typical download time for 6428x4176 in KStars/Ekos of around 0.6sec.

I have the camera connected through a USB3 hub which plugs into one of the RPi's USB3 ports and the flash stick storage directly in the other USB3 port of the RPi. If you have the camera and storage sharing a single USB3 port of the RPi (eg. both connected to a hub) that might go some way to explaining it. Of course, if there is some USB bandwidth problem going on, your throughput on the other cameras may be similarly hobbled but I have no comparison for those.

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