Best practice tip

Hi all,
I'm coming to start a new project using an old version of Pentaho EE: v 4.6.


I need a tip in order to start in the right direction, then I expose you the work that I'm coming to start.


I have to buil a NEAR REAL-TIME BI SOLUTION wich takes as input a JMS, which consumes about 1000 records per minute,
then I have to aggregate the input data in a time-based window (i.e. 3-5 min.)


Then the point: about you is better to store the data in a intermediate DB and then read data to visualize it, or
is better to display directly the data on the dashboard by creating a report, whit PDI as data sources, and refreash the dashboard every 1 minute?

THANKS