Comment 49 for bug 775117

If you were fed up with updates etc. overwriting the file, you could always add a script that overwrote the file on each boot - adding this to /etc/rc.local would do it (before 'return 0':

# Overwrite network.mount to fix slow thunar start bug
conffile=/usr/share/gvfs/mounts/network.mount
echo "[Mount]" > "$conffile"
echo "Type=network" >> "$conffile"
echo "Exec=/usr/lib/gvfs/gvfsd-network" >> "$conffile"
echo "AutoMount=false" >> "$conffile"

A bit annoying but would do the trick!