I was wondering if my downspeed was so little, but after switching debian mirrors I really wondered. Well, to make it clear, the limitation was not on my side, seems somewhere server side. so to cirumevent that and have reasonable download speed, just pipe the downloads to wget and do them parallely :d
cd /var/cache/apt/archives/ apt-get -y --print-uris install $x | egrep -o -e "http://[^\']+" | xargs -l3 -P5 wget -nv apt-get -y install $x
works as well with dist-upgrade!