Addressables is about distributing assets. Nothing to do with code.
It’s not Addressables, it’s Assembly Definition
See, the names are similar, so it can be confusing.
You can see in the editor.log where the time is spent on a domain reload. There’s also a package out there somewhere to profile the time spent in a domain reload visually.
Is this the package?
I don’t know if it is still available, as it hasn’t been updated in several years, but would it be worth a try?