iPod Touch first-gen WiFi speed

For a long time the WiFi speed on my (first generation) iPod Touch was abysmally slow. Downloads from the App Store or over-the-air podcast downloads were at about 5 kbps. The wireless router I was using was 802.11g with WEP encryption.

Yesterday I changed my router to a wireless-N router (with WPA-PSK encryption) and the speed has suddenly shot up to the full capacity of my broadband connection. I'm not sure if this is because of the wireless-N connection or the way the iPod Touch handles WEP encryption which was slowing things down.

Has anyone else experienced this issue?