do the math... or check it with Wireshark
the amount of traffic due to EIP is low. and CIP safety packets are also small and far apart - RPI is some 25ms or so. for Ethernet port those 25ms is an eternity... it can send and receive many messages every millisecond so utilization due to EIP is low.
in fact so low that same KLI port is used for many things including EKI, RSO, FastSendDriver etc.