Thanks karog. The performance degradation is what I'd understood would happen, but I wasn't sure if it would impact me because I have 15 Mpbs down, 1Mbps up.
Does the slowdown happen from eth0 to the bridged ports? Or does it also affect traffic between the two bridged ports eth1 and eth2? I do have computers with gigabit network cards and would like to see reasonable transfer rates when copying files between computers.
In my case, would you recommend that I just use the WAN + 2LAN wizard and just not use the second LAN port?