We have a multisite wordpress setup like this: domain.com/nz domain.com/au domain.com/us etc. I would like to know the best approach for the best setup so we can give each country the best site speed and load times and also being able to scale the website. If we host in Us then NZ users get a slow loading page. If we host in NZ then Us get a slow loading experience.
Once option is to break the sites out into single Wordpress sites but we will also have a forum which is a global site and an application domain say domain.com/app or app.domain.com which we ideally would like the user to be automatically logged into from their respective country site. The app needs to be global so all users of all sub country sites can interact.