This is related to bug #267051. You can tell by the upstream bug report.
A similar Debian bug report is here
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=506715
Note how the "at-spi-registryd" process appears next to nautilus.
I'm attaching 3 gdb backtraces.
To obtain these:
1. Install debug packages "nautilus-dbg", "libgtk2.0-0-dbg",
"libglib2.0-0-dbg", "libatk1.0-dbg".
2. Completely close nautilus with "nautilus --quit"
3. Run the debugger "gdb nautilus" as described here
https://wiki.ubuntu.com/Backtrace
4. I try to open /usr/bin which is guaranteed to have at least 1500 files.
5. Nautilus will eventually load the directory, but you need to wait at
least 2.5 minutes on a slow computer. The time increases with the number of
files.
6. Interrupt the process in the terminal with Ctrl+C. You may do this while
nautilus is still unresponsive; if you wait for it to finish loading the
directory you won't have anything interesting in the backtrace.
In the first backtrace the only library without symbols is
"/usr/lib/gtk-2.0/modules/libatk-bridge.so", which is included in the
"at-spi" package, which also provides "/usr/lib/at-spi/at-spi-registryd"
7. To obtain the other two backtraces install the debug symbols for this
library, which are found in "libatspi-dbg"
8. Briefly looking at the source code in gail/gailtreeview.c,
iterate_thru_children() is a recursive function, and according to one backtrace
it is called a gazillion times.
9. The other backtrace shows a different output. You can run gdb several
times to get different outputs each time, depending on the moment you hit
Ctrl+C. I tested this on a single core, AMD64 processor, running 32-bit Ubuntu
8.10. If you have a multicore machine, you'll see threads everywhere in the
backtraces.
10. Running "valgrind" with nautilus takes a LOT of time to even start. It
outputs several lines concerning python2.5 and python libraries, which I
believe is totally unrelated to this bug.
ECC
** Attachment added: "gdb-nautilus-gtk2-glib2-atk1.txt"
http://launchpadlibrarian.net/23340915/gdb-nautilus-gtk2-glib2-atk1.txt
** Attachment added: "gdb-nautilus-gtk2-glib2-atk1-atspi-1.txt"
http://launchpadlibrarian.net/23340916/gdb-nautilus-gtk2-glib2-atk1-atspi-1.txt
** Attachment added: "gdb-nautilus-gtk2-glib2-atk1-atspi-2.txt"
http://launchpadlibrarian.net/23340917/gdb-nautilus-gtk2-glib2-atk1-atspi-2.txt
--
Nautilus is very slow in list mode with assistive technologies enabled
https://bugs.launchpad.net/bugs/159042
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