For me cloning worked perfect btw, could do it in a few minutes.
So might be related to the time of the day?
You guys where it is slow could do a tracepath / tracert to github and see if you pass the same network. Might be that the connection in that backbone is limiting.
At least from my university it looks like it is routed over japan, resulting in a 100ms ping.
At home it seems to be routed the other way around the world with a <40 ping.
OK I think I know what is wrong.
It is the eclipse git client that does not support https. At least I found this info somewhere on the net.
I did not have problems when I cloned using the http protocol.
So the solution is to use the command line to clone the repository and then add local repository in eclipse.
Iguess that later I will need to define an update as an external command in eclipse.
Hope that the guys who make the eclipse git plugin will improve it in the future.