Using the “master-port” the traffic is processed directly in the switch chip, torch is done at the CPU, but using “master-port” packets dont get to the CPU.
But, when using Bridge, all ports share a single 1 gbps link to the CPU, so your layer 2 performance will suffer horribly. If you need to see all the traffic from a single port when using Master/slave port configuration, use port mirroring.