Deep Linking with copying the data between the apps

[ADRN]

Hi, 

I have a big app and want to make it faster by splitting it's functionalities into smaller apps linked together. 

I know that we can use LINKTOAPP and other deep link funcions. 

But is it possible to for ex. create connection and copying the data from one app to another?
I know you can do that if you put the same data source in both apps. 

[Like: app 1  can create new customers and app 2 can take orders. 
If I want to send the data, I need both apps to connect to both tables: Customers, Orders. ]

I don't want it like that, because it would require that my main app (which is already quite big) has to have more tables in it. 
Is it possible? 
OR linking like that won't affect the performance?

Thanks in advance!