In our Paris office, we are lucky enough to have a fiber optical line at 100 MBs both ways (download and upload). My Macbook has wifi G installed, so that's 54MBs max. Turns out that real life performance of the Apple Airport Express bas station is closer to 20 Mbs (I am siting 2 meters away from the station).
So for the first time in my life I have a WAN faster than my LAN ! I remember when I started my first internet company in 1995, the best we could have for about 2 000 euros per month was a dedicated leased line at 64KBs...
I was testing speed with Speedtest and I found that I am peaking at 17 MBS with the wifi and close to 60Mbs with the ethernet cord ( and I am sure it is limited by the 100MBs switch we have in the office)... Speedtest tells me that at this speed, I am faster than 99% of the broadband connections in the world.
I guess I'll have to either use ethernet form now on, or buy the new Macbook with Wifi N (supposedly much faster than the G version at 250 MBs). Has anyone had experience with N wifi ? Is it really faster in real life ? Does the new Apple Airport Extreme handles over 100 MBs in real life ?