I'm using shared (between few clients of a vendor) 10GB cross-connect in exchange data center. We receive few multicast data streams (each stream delivers data on some group of "stocks"/derivatives).
In total all the streams do not exceed 10GB line rate (never).
Some exchange representatives telling me that dedicated (not shared) cross-connect should deliver better latency profile because then you can select only multicast streams you want so the line is less busy.
But could it be true given the line is never saturated / no congestion? Network equipment on our side of cross connect can easily deal with 10GB line rate also, there are no buffering / queueing ever.
If there is some advantage in keeping network traffic low can the delay in delivery exceed 10GB ethernet interpacket gap (~9.6ns)?