Slow database

Recently switched from Mairlist version 5 Pro to version 7.0 Pro, the problem we now encounter is the speed of the database, if you log in to the database from home to the studio, it is very slow, we have not had this with the 5.x version, even once you are in the database it is very slow.
anyone any idea how to fix this?

Do you get answer about the slow database?
I have the same problem slow I’m using V7.0.3 snapshot 5050 mairlist?
Not only the database, mairlist is slow as well.
Working with mySql MariaDB version 10 on NAS.