Performance of WAN Port

Hi there,
I ordered a 120 Mbit/s line from my provider. After some speed issues I had a online session with the service provider today. I was getting 80-90 Mbit/s ....
He advised me to take out the AirPort Extreme between the Cable Modem and my Mac Mini. First of all I did not think this will bring any improvement since the Modem is GBit Ethernet and the Mac Mini and Airport Extreme too....
As he insisted on that I took it out and what happened? Internet performance went up from 80-90 to 110-115 Mbits.
So actually there is a real cut in performance - is this a general performance limitation, like firewall/nat or whatever is making airport busy and not letting trough more than 100 Mbit .... or is the WAN port only 100Mbit?
Is there anything to tune?
Oh by the way the extreme is 2 weeks old - so it is latest model (MC)
Thanks in advance!

I've owned several routers from different manufacturers and have worked with several Internet service providers and have found that the routing process will cause, on average, a 15-20% drop in speed when compared to a straight through connection from the modem to a computer. Sometimes, its a bit more loss and sometimes a bit less.
There is no doubt that the the NAT firewall accounts for some of this loss in the routing process and the process of sharing a single connection from the modem is likely to cause some loss as well.
If had a 100 Mpbs service from the provider, I would expect on average to see speeds in the 80-85 Mbps range using an ethernet connection through the router. The Internet connection speed often varies on most providers during the day depending on the number of users on the system.
If you are talking about wireless speed, there is more speed loss here through the router due to the security encryption process.
Now, the results of other users may vary. Hopefully, they will post to give us more perspective. Based on the different routers I've used with different providers, I would say that your results are in the range that I would expect.

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