Hello all, I live in the UK and I’ve recently purchased an RT-N66U to connect to my BT Infinity fibre broadband. This is true fibre, the fibre cable enters my house and connects to a fibre modem provided by BT, and gives me ~300 Mbps down and ~20 Mbps up. My new router connects to the fibre modem via Gigabit Ethernet. The problem is that the RT-N66U isn’t giving me the full 300 Mbps, it’s only giving me around 210 Mbps. Background: In addition to the fibre modem, BT (the ISP) also provided me with a router known as the “Home Hub 3” (or HH3), which has a Gigabit Ethernet WAN port, and 4 Ethernet LAN ports, of which a single port is Gigabit; it also has Wifi. Using the HH3 I can consistently get just over 310 Mbps by visiting speedtest.net, whereas using the RT-N66U the highest I’ve ever seen is 210 Mbps. Given that SmallNetBuilder benchmarked the WAN to LAN speed of the RT-N66U at 732 Mbps, something clearly isn’t right. All my tests are from a GigE wired PC (core i7, 8 GB RAM, Windows 8), have been repeated numerous times over a period of almost two weeks, and are very consistent: slightly over 310 Mbps with the HH3, slightly over 210 Mbps with the RT-N66U. This is my setup: Fibre --- Fibre Modem --- GigE --- Router --- GigE --- Gigabit Switch --- GigE --- PC Swapping out the router between the Home Hub 3 and the RT-N66U produces very consistent results. Nothing else changes; the cables are the same, the LAN IP on both routers is set the same. Literally I disconnect the two GigE cables from one router and connect them to the other router, power the router on, wait for things to boot and connect (1 – 2 minutes in both router’s cases), and test. QoS and DoS protection are both disabled on the RT-N66U. Until last night I was running firmware 260, and last night I upgraded to beta 321 -- same test results. The Internet connection requires PPPoE (with a generic username and password), and I wonder if this is where the bottleneck is occurring? I tested plugging my 3-year-old Core 2 Duo laptop directly into the fibre modem and configured a PPPoE connection in Windows 8, and it connects fine, but I only achieved ~60 Mbps while the laptop's CPU rocketed to almost 100%. So it appears that the PPPoE connection is very CPU intensive, and perhaps that is what the Asus isn't handling very well. I suspect the Home Hub 3 has a flag on its PPPoE client that disables something (perhaps encryption) that makes it a lot less CPU intensive, allowing it to achieve the full 300 Mbps -- the HH3 is a small/cheap router, and I refuse to believe it has more processing power than the RT-N66U. Now I just need to know what PPPoE tweak is needed on the RT-N66U (there is a field for "additional parameters). I’m hoping somebody has come across this issue and will be able to help me. Everything else about the router is awesome, it seems stable, the Wifi performance is fantastic, and generally I’m very happy with it. 210 Mbps is an amazing speed to have, but given I can achieve 300 Mbps with the cheap ISP router, surely the RT-N66U can achieve this also! Enquiring minds want to know. Thanks for taking the time to read this, and thanks for your help!