"Preparing the watch for development via iPhone" re-occurs too many times

Every time I build my app, at the first compile since Xcode launched, I see this screen, and Xcode is stuck here for any time between 5 and 30 minutes, and I'm not even developing an Apple Watch app:

I have seen similar articles, but with no real resolution. After googling for a few minutes, this should happen when the OS is updated, but it happens literally when compiling any app for the first time since opening Xcode, and it also wastes a hell lot of time, because I cannot even edit code while waiting. Any tips?

Unfortunately this is going already on for way too long,

if you don’t make watch apps, disable Bluetooth to skip this step.

"Preparing the watch for development via iPhone" re-occurs too many times
 
 
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