When changing your sources in the /etc/slapt-get/slapt-getrc:
file it may be best to find a mirror that is close you and use that one instead.
here is the link to the mirrors that host slackware
http://www.slackware.com/getslack/
that way you get one that is closer or faster.
also make sure that you get the link for the 12.0 or "current" sources


gslapt is the gui for slapt-get.
