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As you are having a very big database allocate more auxiliary channels.
RMAN will connects to primary server & it reads its control file, but not much load on primary database.
RMAN CHANNEL – An RMAN Channel is a communication pipeline between a RMAN executable and a target or auxiliary database. An RMAN channel consists of a server session on the target or auxiliary database and a data stream from the database to the backup device or vice-versa. RMAN console sends commands to the database using this channel, and the server session running on the database executes the command on behalf of the RMAN Recovery Manager
And deals only with the backup of standby , it's just read control file of primary & very limited part of database.
You have to take care of LARGE_POOL in auxiliary instance, until RMAN completes give a big value.
Thank you very much Ckpt.