kcrisman,

You've discovered the tangle of tickets on this I alluded to
above.  ;-)

1.  You can delete all your old snapshots to reclaim disk space (or
relieve quota limits in a shared environment).  I used some
incantation with find, xargs, and rm (carefully) which cleared them
out for every worksheet all at once.  Like Jason I had a few gigabytes
worth across about 100 worsheets from about a year's worth of use.

2.  I think the performance hit comes from backing up  nb.sobj, from
the original in .sage/sage_notebook to a collection of backups
in .sage/backups   The default timing on this is very frequent IIRC.
My nb.sobj is about 30 MB, but my home directory is on a portable USB
drive that I shuttle around, so I noticed the delays due to these auto-
saves perhaps sooner than others might.  I'm not sure what it takes to
shrink this file.  I set the autosave interval to be about 20 minutes
and am keeping fewer backups (two instead of three) and  no longer see
the regular slowdowns as I work in the notebook.

3.  When I quit a server that has been running the notebook, it takes
about 2 minutes for a clean shutdown, which I assume is the same sort
of action.

The original patch at http://trac.sagemath.org/sage_trac/ticket/5371
has some comments in it about extending the default save times if you
wnt to take immediate action.  Some of the names of these autosave
variables are mildly misleading, though this is corrected in some of
the patches (above) addressing the situation.

Rob

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