I've noticed for a while now, from the US, cloning "git.openwrt.org/openwrt/openwrt.git" has been very slow. Sometimes the connection will die and other times it will crawl at 200kbps or less.
I've tried from various locations in the US and the same result. I've also tried from European locations and it is a little better, but not by much.
I'm not sure what is causing the slow down, but wanted everyone to be aware.