i am working on my next project currently which works 100% on mongo, my past projects worked on SQL + Mongo on which i used AWS RDS + AWS EC2 and could connect them both in AWS internal IP which result me with much faster connection.
Now in mongo there is alot of fancy cloud servers like MLab and MongoDB Atlas which is actually cheaper then AWS.
My concern is that moving back to external DB connection will be slower and more network consuming then the internal connection in RDS
Have anyone experienced in such issue? maybe the different isn't that big as i make it but i need it to be optimized