I did a quick test based on your config with some minor changes to suit my environment. I used a DHCP Client on E1 instead of PPP and different IP's due to a conflict with yours
Basically it seemed to work much as would be expected.
I did a copy from two ports on the same switch group and a copy between the two switches with the master ports bridged.
Both gave about the same speed (43MBps) but the CPU load was different.
A CPU load of 2% when copying between ports in the same switch:
transfer - P6-P9.jpg
and 40+% when copying between the two switches via the Bridge:
transfer - P2-P9.jpg
You should also note the throughput on the port speeds as well. The traffic does not show at all when copying between ports in the same switch but does when you go through the bridge.
Here are the settings I used :-
/interface bridge
add l2mtu=1520 name=Local
/interface ethernet
set 0 arp=proxy-arp name=ether1 speed=1Gbps
set 1 name="2 - Master" speed=1Gbps
set 2 master-port="2 - Master" name="3 - LAN" speed=1Gbps
set 3 master-port="2 - Master" name="4 - LAN" speed=1Gbps
set 4 master-port="2 - Master" name="5 - LAN" speed=1Gbps
set 5 name="6 - Master" speed=1Gbps
set 6 master-port="6 - Master" name="7 - LAN2" speed=1Gbps
set 7 master-port="6 - Master" name="8 - LAN2" speed=1Gbps
set 8 master-port="6 - Master" name="9 - LAN2" speed=1Gbps
/interface wireless
set 0 band=2ghz-b/g/n disabled=no frequency=2452 l2mtu=2290 mode=ap-bridge \
name=WLAN ssid=AWC wireless-protocol=802.11
/ip pool
add name=dhcp_pool1 ranges=192.168.11.100-192.168.11.200
/ip dhcp-server
add address-pool=dhcp_pool1 disabled=no interface=Local name=dhcp1
/interface bridge port
add bridge=Local interface="2 - Master"
add bridge=Local interface="6 - Master"
add bridge=Local interface=WLAN
/ip address
add address=192.168.11.254/24 interface=Local
/ip dhcp-client
add disabled=no interface=ether1
/ip dhcp-server network
add address=192.168.11.0/24 dns-server=192.168.11.254,208.67.222.222 gateway=\
192.168.11.254 netmask=24
/ip dns
set allow-remote-requests=yes cache-size=512KiB max-udp-packet-size=50 \
servers=192.168.10.1
/ip dns static
add address=192.168.11.254 name=router
/ip firewall filter
add chain=input comment=LAN src-address=192.168.11.0/24
add chain=forward src-address=192.168.11.0/24
add chain=input comment="Accept established connections" connection-state=\
established
add chain=input comment="Accept related connections" connection-state=related
add action=drop chain=input comment="Drop invalid connections" \
connection-state=invalid
add chain=input comment=UDP protocol=udp
add chain=input comment="Winbox in" dst-port=8291 protocol=tcp
add action=add-src-to-address-list address-list=ssh_blacklist \
address-list-timeout=1w3d chain=input connection-state=new dst-port=22 \
protocol=tcp src-address-list=ssh_stage3
add action=add-src-to-address-list address-list=ssh_stage3 \
address-list-timeout=1m chain=input connection-state=new dst-port=22 \
protocol=tcp src-address-list=ssh_stage2
add action=add-src-to-address-list address-list=ssh_stage2 \
address-list-timeout=1m chain=input connection-state=new dst-port=22 \
protocol=tcp src-address-list=ssh_stage1
add action=add-src-to-address-list address-list=ssh_stage1 \
address-list-timeout=1m chain=input connection-state=new dst-port=22 \
protocol=tcp
add chain=input comment="SSH In" dst-port=22 protocol=tcp
add chain=input comment="Allow limited pings" limit=50/5s,2 protocol=icmp
add action=drop chain=input comment="Drop excess pings" protocol=icmp
add action=log chain=input comment="Log everything else" log-prefix=\
"DROP INPUT"
add action=drop chain=input comment="Drop everything else"
/ip firewall nat
add action=masquerade chain=srcnat src-address=192.168.11.0/24
/ip smb shares
set [ find default=yes ] directory=/pub
/system clock
set time-zone-name=Australia/Sydney
/system gps
set set-system-time=no
/system health
set fan-mode=manual use-fan=auxiliary
/system lcd
set contrast=0 enabled=no port=parallel type=24x4
/system lcd page
set time disabled=yes display-time=5s
set resources disabled=yes display-time=5s
set uptime disabled=yes display-time=5s
set packets disabled=yes display-time=5s
set bits disabled=yes display-time=5s
set version disabled=yes display-time=5s
set identity disabled=yes display-time=5s
set "9 - LAN2" disabled=yes display-time=5s
set "8 - LAN2" disabled=yes display-time=5s
set "7 - LAN2" disabled=yes display-time=5s
set Local disabled=yes display-time=5s
set "6 - Master" disabled=yes display-time=5s
set "5 - LAN" disabled=yes display-time=5s
set "4 - LAN" disabled=yes display-time=5s
set "3 - LAN" disabled=yes display-time=5s
set "2 - Master" disabled=yes display-time=5s
set ether1 disabled=yes display-time=5s
set WLAN disabled=yes display-time=5s
/system ntp client
set enabled=yes primary-ntp=192.189.54.17 secondary-ntp=202.158.218.239
/system routerboard settings
set force-backup-booter=yes
/tool user-manager customer
add backup-allowed=yes disabled=no login=admin parent=admin password="" \
paypal-accept-pending=no paypal-allowed=no paypal-secure-response=no \
permissions=owner signup-allowed=no time-zone=-00:00
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