Slow file transfer using Samba server - 1-6Kb/sec!

Suse Linux Enterprise Desktop running Samba
Windows XP Pro client copying files to the Samba server runs slower that a glacier at anywhere from 1-6Kb/sec. A one legged lame dog goes faster!!
How do I speed this up?

* I have tested uploads and downloads using pure-ftp and they crank at a healthy 10-12MB/sec, so the underlying link must be sound.  Is this logic sound?

Given that FTP runs fine in both directions, there must be an issue with Samba.  Here is my basic smb.conf file:

#############################################
# smb.conf is the main Samba configuration file. You find a full commented
# version at /usr/share/doc/packages/samba/examples/smb.conf.SUSE if the
# samba-doc package is installed.
# Date: 2007-05-16
[global]
      workgroup = TUX-NET
      printing = cups
      printcap name = cups
      printcap cache time = 750
      cups options = raw
      map to guest = Bad User
      include = /etc/samba/dhcp.conf
      logon path = \\%L\profiles\.msprofile
      logon home = \\%L\%U\.9xprofile
      logon drive = P:
      usershare allow guests = No
      add machine script = /usr/sbin/useradd  -c Machine -d /var/lib/nobody -s /bin/false %m$
      domain logons = No
      domain master = No
      netbios name = srv1
      security = user
      # Large readwrite = No Boosts network speed!
      large readwrite = No
      server string = SRV1
      unix password sync = Yes
                # Socket options testing - made no difference
      socket options = TCP_NODELAY

## Share disabled by YaST
# [homes]
#      comment = Home Directories
#      valid users = %S, %D%w%S
#      browseable = No
#      read only = No
#      inherit acls = Yes
# [profiles]
#      comment = Network Profiles Service
#      path = %H
#      read only = No
#      store dos attributes = Yes
#      create mask = 0600
#      directory mask = 0700

[data]
      comment = Home
      path = /home
      read only = No
      inherit acls = Yes
      browseable = Yes

#      veto files = /aquota.user/groups/shares/

[zanotech]
      comment = Zanotech
      path = /home/zdata/zanotech
      read only = No
      inherit acls = Yes
      browseable = Yes

[printers]
      comment = All Printers
      path = /var/tmp
      printable = Yes
      create mask = 0600
      browseable = Yes
[print$]
      comment = Printer Drivers
      path = /var/lib/samba/drivers
      write list = @ntadmin root
      force group = ntadmin
      create mask = 0664
      directory mask = 0775

## Share disabled by YaST
# [netlogon]
#      comment = Network Logon Service
#      path = /var/lib/samba/netlogon
#      write list = root
############################################


ifconfig look OK doesn't it?

eth0      Link encap:Ethernet  HWaddr 00:50:04:C3:96:81
          inet addr:10.0.0.20  Bcast:10.255.255.255  Mask:255.0.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:396629 errors:0 dropped:0 overruns:27 frame:0
          TX packets:361524 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:322950102 (307.9 Mb)  TX bytes:326769151 (311.6 Mb)
          Interrupt:217 Base address:0xcc00
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