Should you Map Data in PLC Into Contiguous Blocks ? (Mitsubishi Ethernet iQ-R series)

Hi,

I am adding a new Mitsubishi Ethernet iQ-R series PLC to an existing FTView SE SCADA which is using Kepware for comms.  The issue is the addresses I need to add to the new Kepware config have not been mapped into contiguous blocks and are widely spread about.  Will this be a problem if I create static tags in Kepware with such scattered addresses ?

When I began working on SCADA systems in the 90's I was always told that any data that was to be read or written to by SCADA should be mapped into contiguous blocks, otherwise you would end up getting multiple read transactions which would affect comms performance.  Is this still valid today with fast Ethernet and multi core CPU's ?