master/slave eth or join bridge

Can anyone explain the different between creating a bridge that has individual eth ports as members vs adding a bunch of slave ports to one master port? Performance differences, ability to have a “slave” vlan on a master port like you can in a bridge?

The bridge is implemented at the RouterOS level (uses CPU cycles) whereas the master/slave options refer to ports on switch chips which can be enslaved without giving RouterOS more work to do.