I'm currently downloading the distfiles for the ebuilds that the tinderbox is going to merge and I like archives for.. one thing I noticed is that given we use multiple wget commands, we don't currently have a way to re-use the same http connection for them, which is quite a waste to be honest. Could be a good idea to look into it, IMHO.
Similar to bug 265438 which is about ftp. Can probably use http_proxy as a workaround.