Hi all, I've just committed in trunk r1705 a bugfix to HaloFinding.py that addresses a problem some users were seeing. In particular, the same data field was being repeatedly read off disk, once per halo, which seriously degraded performance. If you want to upgrade to the latest trunk version, "yt instinfo -u" should do it. _______________________________________________________ sskory@physics.ucsd.edu o__ Stephen Skory http://physics.ucsd.edu/~sskory/ _.>/ _Graduate Student ________________________________(_)_\(_)_______________