I have only one box with 11-STABLE, now rebuilding. I shall try my luck without xf86-video-* and then build WM & minimal ports except firefox & palemoon. I don't understand the diference ofportsnap
and svn'ing.
Portsnap gives you only the head branch 1) of the ports tree with its own update tracking system. With SVN you can checkout and update any of the quarterly branches 2) as well. You have to choose to use only one of the methods because you can't update a ports tree checked out with portsnap(8) with SVN and vice versa.
1) https://svnweb.freebsd.org/ports/head/
2) https://svnweb.freebsd.org/ports/branches/