Hiya!
For a year or so I used RB750G on a 12/6 Mbits connection and everything worked fine. 2 months ago I got 100/5 Mbits fiber optic link, and since number of computers in network went to a 200+ I decided that is time to get a new router. I bought RB1100AH x2 and retired old one.
Now problem is that the my connection is running approximately half speed o_O, to be specific 50-54Mbits out of 100Mbits. I called ISP and their sys admin runned speed test to my WAN interface (pub IP) and it went to 500Mbits+ (ofc multiple connections).
Honestly I dont believe that problem is in RB, cause there is no advanced settings on router just simple PPPOE connection and DHCP and few firewall rules. If anyone had similar problem or know solution Im looking foward to your answer.
TY.
EDITED: I tested old RB750G runs at full speed - seems like its 1100’s problem.