Mine instead starts up in 2 seconds (before the splash screen is shown). I have 8gb of ram, 512gb ssd, 2017 21.5 "4k imac.

I put a 512gb ssd and now it goes, loading is not immediate, but at least part of it. Thanks a lot

Ok sorry

Yes, it's a duplicate, but I don't know how to close it...

No I did not understand the disk space, but from the slowness of the hard disk (hdd) I have, I thought it would be enough to install an SSD to solve the problem. However as regards the ram memory, when I open xcode, I only have that app open, if I open Safari together, for example, it crashes or everything goes very slow ...

Ok, so do you think it depends on the ram memory? and not from the hard disk? Thanks a lot

I have 950gb free on the hard drive. I looked at the use of the ram in activity monitoring, while xcode is running, but at the max it uses 6gb of ram, the ram usage line is always green. Do you still think it's a ram problem?

Ok! Thank you very much for your availability. Good day. I really hope to solve it, I'm looking forward to studying Swift and trying to make an app.

I don't know how long it takes, I let it load about 20 minutes and no preview appeared, in the meantime the mac was very slow ... what damage can the mac have? I also performed the SOS of the disk but everything is ok

My mac has 8gb of ram, it's 21.5 "4k. I reinstalled macOS ...