[notmuch] Notmuch performance problems on OSX

[Oliver Charles]

Actually, significant performance problems. Ho ho ho. (sorry)

I've installed the latest notmuch from Git at this time of writing,
along with Xapian from SVN head. However, just tagging a single thread
with only one message seems to take too long:

$ time notmuch tag +dissertation thread:7dc536441e6deade4256a46d46451221

real	0m0.812s
user	0m0.022s
sys	0m0.037s

And tagging all my messages is really horrible:

$ time notmuch tag +foobar tag:inbox

real	0m5.076s
user	0m3.688s
sys	0m0.105s

Here is what my notmuch binary links with:

$ otool -L /usr/local/bin/notmuch
/usr/local/bin/notmuch:
	/usr/local/Cellar/gmime/2.4.0/lib/libgmime-2.4.2.dylib (compatibility
version 7.0.0, current version 7.0.0)
	/usr/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.3)
	/usr/lib/libiconv.2.dylib (compatibility version 7.0.0, current version 7.0.0)
	/usr/local/Cellar/glib/2.20.5/lib/libgobject-2.0.0.dylib
(compatibility version 2001.0.0, current version 2001.5.0)
	/usr/local/Cellar/glib/2.20.5/lib/libglib-2.0.0.dylib (compatibility
version 2001.0.0, current version 2001.5.0)
	/usr/local/Cellar/gettext/0.17/lib/libintl.8.dylib (compatibility
version 9.0.0, current version 9.2.0)
	/usr/local/Cellar/xapian-svn/HEAD/lib/libxapian-1.1.3.dylib
(compatibility version 4.0.0, current version 4.0.0)
	/usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.4.0)
	/usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current
version 111.1.4)

That xapian-svn was built from svn HEAD right now, so I'm assuming it
contains the #250 fix (http://trac.xapian.org/changeset/13808)

Any ideas?

-- 
    Oliver Charles / aCiD2