nautilus performance when copying several files from smbnetfs (fuse)

I'm using smbnetfs for accesing a remote fileserver:

   smbnetfs on /tmp/test type fuse.smbnetfs (rw,nosuid,nodev,user=e10000)

when I copy a directory with several (hundreds) of files performance is really bad and it takes lot of time.

for example a directori with 300 files takes 5 seconds with `cp' command

   $ time cp -r USMT301/ /tmp/

   real 0m4.671s
   user 0m0.020s
   sys 0m0.128s

and with nautilus takes about 10 minutes. so it's clearly a problem with nautilus, not smbnetfs.
if you copy just one big file (for example an ISO) performance is OK.

to replicate just launch smbnetfs and copy a dir with several files with nautilus.

I'm not sure if it affects other fuse filesystems and it seems related to nautilus not recognizing fuse mount point as a remote filesystem.

maybe related:

https://bbs.archlinux.org/viewtopic.php?id=101691
https://bugzilla.gnome.org/show_bug.cgi?id=657208

this is a critical stopper for me as I already migrated 50 desktops to linux in my department and I just discovered this.
any solution or workaround will be really wellcome.

please, ask for further info.

   $ lsb_release -rd
   Description: Ubuntu 12.04.3 LTS
   Release: 12.04

   ii nautilus 1:3.4.2-0ubuntu8 file manager and graphical shell for GNOME
   ii smbnetfs 0.5.3a-1 User-space filesystem for SMB/NMB (Windows) network servers