I have a 2019 MacBook Pro and the SwiftUI previews take sometimes can take 5-8s to come up so I don't think you'll see any change in SwiftUI with the upgrade at all. If your only concern is SwiftUI you should be fine with the 2012 MacBook Pro.
davidfejes
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
From
Hungary
Post
Replies
Boosts
Views
Activity
Still no way to link it?