Ethernet cable faster than Wifi?

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http://crunchbanglinux.org – Well.. here it is:Two machines connected with each other through router. Desktop uses cable, laptop is wifi (intel wifilink 1000 b/g/n). Both have Statler, absolutely same network prefs. I use gftp to exchange files between the machines. Now is the main part - transfer speed desktop-laptop is 5.5MB/s, laptop-desktop is 3.6MB/s. BTW, while desktop allows download and upload, laptop only downloads. I don't get it, network prefs are the same on the machines. Is Wifi makes difference?Update: I've connected laptop to router with ethernet cable, so now both machines are wired. Well... the (HowTos)