RB4011 doesn’t have a good switch chip. That means that you can only create VLANs controlled by the CPU chip (software based instead of HW accelerated / offloaded. That means that you need to create a bridge interface per VLAN and only one bridge interface can give you wired speed. The others will not and might hurt your router’s CPU load.
This is a great router but for VLANs you need a switch with L3 functionality. Any CRS3.x will do this
The first quoted sentence is true. The second one is not.
Use of multiple bridges, one per VLAN, is deprecated. Since ROS version 6.42 it is advised to use single bridge with vlan-filtering=yes set. This way, bridge behaves as VLAN-aware / managed switch and will deal with VLAN tags just fine.
Regarding HW acceleration: as soon as ethernet ports are not directly members of bridges (i.e. if one created vlan interface on top of ethernet interface), then bridges can not be HW accelerated as intermediate layer (in this case vlan interface which is handled entirely in software) blocks possibility for HW acceleration.
@OP: definitely go with link posted by @gazingbazooka, it’s a very fine tutorial