cross-app relationships and performance

I've decided to use App 'Clusters' and that is working pretty well. We have a corporate business line that has a lot of the main information like employee info, financial data, etc. Then I have sub business lines that have their own 'clusters' for project management etc. These clusters use cross app relationships, but I only sync tables from the Corporate App. Thus, each cluster is separate from each other. So far, so good. You may be able to implement something like that?

Just be careful, you have to be very intentional to not accidentally link the apps. Even a report link from one app to another, or a multi select shared field can suddenly link them and share resources.