networking - Slow network speeds

Given the following network setup:

Cable Model --(wired)--> Router --(wireless)--> Ethernet Bridge --(wired)--> PC

Testing download speeds:

• From Internet to Cable Modem = 100 mbit


• From Internet to Router = 100 mbit


• From Internet to PC = 50 mbit



• From Router to PC = 100 mbit

If router <-> PC succeeds at 100mbit, Why would Internet <-> PC only be 50mbit?

Some notes:

• All transfers were over HTTP (even Router <-> PC tests)


• QoS disabled on the router



• Only wireless connection is @ 5Ghz 802.11N between Router & Ethernet Bridge


• Cable modem is connected to WAN port on Router.


• Router: ASUS RT-N66U


• Ethernet Bridge: ASUS EA-N66U

One hunch: perhaps there's some router inefficiency in WAN -> Wifi communication that's not present in LAN -> Wifi and in WAN -> LAN communications.