This is really odd, perhaps someone could explain it to me.
On my linux machine, maps download in game at around 12kb/s, sometimes as high as 23kb/s. When downloading them through wget or a browser I get the standard 200-500kb/s.
First I thought that the problem was there was too much traffic from an active server, so I got my friend to set up his server privately with a medium sized map with no players. No change.
Here's where it gets weirder. Under our family windows machine, which shares the same network, (and under every windows machine I've seen with Tremulous) downloads maps ingame at the higher 200-500kb/s rate.
Is this a known bug? Perhaps an issue with curl? I don't know. All I do know is that it is really annoying to have Windows machines outperforming my Linux machine when it should be the other way around.