I suppose you are talking about calculated attributes?
if so, why can you not do these calculations once every 5 minutes for these objects and write them to an object when setting up the data. Calculated attributes can be a major hit to your performance because they are calculated every time you retrieve the object. Best practice would be to not use calculated attributes but calculate the attributes once beforehand (or in your case every 5 minutes with a scheduled event or something) and then commit them once to your database.
It might be a good idea to look through the learning paths in the mendix academy where you can learn about the domain model, microflows, best practices etc.