While out at a clients location adding VLans, I had noticed that all of the ports had Bandwidth 100000Kbit and Delay 1 usec added to them. Is there any benefit to this from other than it being defined in say Vlan1?
these parameters have administrative nature and don't reflect the real performances.
They are used by routing protocols like EIGRP and OSPF to calculate the interface cost or metric.
They are used by Modular QoS as a reference for commands that use percentages of total bandwidth instead of an absolute rate.
In a Vlan context you should be fine with default values.
And of course these are attributes of each L3 interface for each SVI Vlan1, Vlan 2 and so on
Hope to help