Processing In General

Keep your storage on your laptop free from any data that doesn't really need to be there. Use it as the working space because the storage in your laptop is faster than the one that communicates over your USB-ports. This specifically goes for Macs as the Apple Silicon is a chip that also harbours video, RAM and storage and that performs extremely fast. So store your files external and transfer them to your laptop when you are going to process them and then transfer them back to the external storage.

Software of ZWO coming with the ASI ecosystem:
Works quite wel for capturing but for processing... not really. Stacking deep sky for instance is dramatically bad as it doesn't take out satellite trails and it isn't interested in how much to drizzle your dithering. It is just very rudimentary processing.

For stacking I use Astro Pixel Processor but the load of parameters is gigantic though there is a quite good manual built in. Just hover your mouse over the item you want explanation of. The tools are good but the sliders for end-processing are way to short and therefor way to sensitive.

For stacking the Sun I use Planetary System Stacker. That works on a Mac but is programmed by someone on a Windows computer and the logic is from... logical. But it does the job though I am not convinced that when it selects on quality instead of sequence (choice) it really does go by quality when selected.

I do use Siril from time to time but still learning and finding my way.

Actually I am interested in PixInsight but it has quite a learning curve and it isn't cheap. Now I'm not shy of spending money on this but I want something that lasts. So i am waiting for the software suite that is under development right now (and in beta phase) by Mac Observatory. The owner of that website has decided to take Astrophotography definitely and finally to the Mac on the level where it sits at the Windows platform. And that also costs money but way less. Yes the first version will have it quirks but I prefer that over going back to Windows.