Please don’t use the old iDRAC Redfish agent anymore. The universal Redfish agent is the way to go.
https://exchange.checkmk.com/p/redfish
There is a version for 2.1 and 2.2
The generic agent should fetch all the information of the vendor dependent agents and some new ones.
If you execute the agent manually you should also see at what point it takes so much time.
The generic agent also has the possibility to select only some sections and omit the too time consuming ones.
If you can provide me some information about the missing output, it would be helpful to see if it can be included.