Samba is running so slow, How can I bump up the speed ?

I'm running Sco OSR 5.0.7 with SAMBA v3.0.14a, my LAN is running at 100mbits/sec. So even at 4 feet from the server I'm getting slow responses on my windoze xp computer from samba. It takes an eternity to copy files from one place to the other. I'm also running another samba server on a linux box on the same LAN but on a different workgroup and seems to work ok. Or is it maybe a bottle neck somewhere in the HUB that sits between my computer and the server (4 feet) ? Is there a good software that detects bottle necks on a LAN or can create charts of currently availble IP's and tells the speed between them ?

Here's my current samba configuration (full view):

# Global parameters
[global]
      dos charset = CP850
      unix charset = UTF-8
      display charset = LOCALE
      workgroup = SYSTEMS
      netbios name = ATKSCO
      netbios aliases =
      netbios scope =
      server string = Samba Server
      interfaces = net2, lo0
      bind interfaces only = Yes
      security = USER
      auth methods =
      encrypt passwords = Yes
      update encrypted = No
      client schannel = Auto
      server schannel = Auto
      allow trusted domains = Yes
      hosts equiv =
      min password length = 5
      map to guest = Never
      null passwords = No
      obey pam restrictions = No
      password server = *
      smb passwd file = /etc/samba/smbpasswd
      private dir = /etc/samba
      passdb backend = smbpasswd
      algorithmic rid base = 1000
      root directory =
      guest account = nouser
      enable privileges = No
      pam password change = No
      passwd program =
      passwd chat = *new*password* %n\n *new*password* %n\n *changed*
      passwd chat debug = No
      passwd chat timeout = 2
      check password script =
      username map =
      password level = 0
      username level = 0
      unix password sync = No
      restrict anonymous = 0
      lanman auth = Yes
      ntlm auth = Yes
      client NTLMv2 auth = No
      client lanman auth = Yes
      client plaintext auth = Yes
      preload modules =
      use kerberos keytab = No
      log level = 0
      syslog = 1
      syslog only = No
      log file = /var/log/samba/log.%m
      max log size = 50
      debug timestamp = Yes
      debug hires timestamp = No
      debug pid = No
      debug uid = No
      smb ports = 445 139
      large readwrite = Yes
      max protocol = NT1
      min protocol = CORE
      read bmpx = No
      read raw = Yes
      write raw = Yes
      disable netbios = No
      acl compatibility =
      defer sharing violations = Yes
      nt pipe support = Yes
      nt status support = Yes
      announce version = 4.9
      announce as = NT
      max mux = 50
      max xmit = 16644
      name resolve order = lmhosts wins host bcast
      max ttl = 259200
      max wins ttl = 518400
      min wins ttl = 21600
      time server = No
      unix extensions = Yes
      use spnego = Yes
      client signing = auto
      server signing = No
      client use spnego = Yes
      change notify timeout = 60
      deadtime = 0
      getwd cache = Yes
      keepalive = 300
      kernel change notify = Yes
      lpq cache time = 30
      max smbd processes = 0
      paranoid server security = Yes
      max disk size = 0
      max open files = 10000
      socket options = TCP_NODELAY SO_SNDBUF=8192 SO_RCVBUF=8192
      use mmap = Yes
      hostname lookups = No
      name cache timeout = 660
      load printers = Yes
      printcap cache time = 0
      printcap name =
      cups server =
      disable spoolss = No
      enumports command =
      addprinter command =
      deleteprinter command =
      show add printer wizard = Yes
      os2 driver map =
      mangling method = hash2
      mangle prefix = 1
      stat cache = Yes
      machine password timeout = 604800
      add user script =
      delete user script =
      add group script =
      delete group script =
      add user to group script =
      delete user from group script =
      set primary group script =
      add machine script =
      shutdown script =
      abort shutdown script =
      logon script =
      logon path = \\%N\%U\profile
      logon drive =
      logon home = \\%N\%U
      domain logons = No
      os level = 20
      lm announce = Auto
      lm interval = 60
      preferred master = Auto
      local master = Yes
      domain master = Auto
      browse list = Yes
      enhanced browsing = Yes
      dns proxy = No
      wins proxy = No
      wins server =
      wins support = No
      wins hook =
      wins partners =
      kernel oplocks = Yes
      lock spin count = 3
      lock spin time = 10
      oplock break wait time = 0
      ldap admin dn =
      ldap delete dn = No
      ldap filter = (uid=%u)
      ldap group suffix =
      ldap idmap suffix =
      ldap machine suffix =
      ldap passwd sync = no
      ldap replication sleep = 1000
      ldap suffix =
      ldap ssl = no
      ldap timeout = 15
      ldap user suffix =
      add share command =
      change share command =
      delete share command =
      config file =
      preload =
      lock directory = /var/lib/samba
      pid directory = /var/run/samba
      utmp directory =
      wtmp directory =
      utmp = No
      default service =
      message command =
      dfree command =
      get quota command =
      set quota command =
      remote announce =
      remote browse sync =
      socket address = 0.0.0.0
      homedir map =
      afs username map =
      afs token lifetime = 604800
      log nt token command =
      time offset = 0
      NIS homedir = No
      panic action =
      host msdfs = No
      enable rid algorithm = Yes
      idmap backend =
      idmap uid =
      idmap gid =
      template primary group = nogroup
      template homedir = /usr/%D/%U
      template shell = /bin/false
      winbind separator = \
      winbind cache time = 300
      winbind enable local accounts = No
      winbind enum users = Yes
      winbind enum groups = Yes
      winbind use default domain = No
      winbind trusted domains only = No
      winbind nested groups = No
      comment =
      path =
      username =
      invalid users =
      valid users =
      admin users =
      read list =
      write list =
      printer admin =
      force user =
      force group =
      read only = Yes
      create mask = 0744
      force create mode = 00
      security mask = 0777
      force security mode = 00
      directory mask = 0755
      force directory mode = 00
      directory security mask = 0777
      force directory security mode = 00
      force unknown acl user = No
      inherit permissions = No
      inherit acls = No
      guest only = No
      guest ok = No
      only user = No
      hosts allow = 192.168.1., 192.168.2., 127.
      hosts deny =
      allocation roundup size = 1048576
      ea support = No
      nt acl support = Yes
      profile acls = No
      map acl inherit = No
      afs share = No
      block size = 1024
      max connections = 0
      min print space = 0
      strict allocate = No
      strict sync = No
      sync always = No
      use sendfile = No
      write cache size = 0
      max reported print jobs = 0
      max print jobs = 1000
      printable = No
      printing = cups
      cups options =
      print command =
      lpq command = %p
      lprm command =
      lppause command =
      lpresume command =
      queuepause command =
      queueresume command =
      printer name =
      use client driver = No
      default devmode = No
      force printername = No
      default case = lower
      case sensitive = Auto
      preserve case = Yes
      short preserve case = Yes
      mangling char = ~
      hide dot files = Yes
      hide special files = No
      hide unreadable = No
      hide unwriteable files = No
      delete veto files = No
      veto files =
      hide files =
      veto oplock files =
      map system = No
      map hidden = No
      map archive = Yes
      mangled names = Yes
      mangled map =
      store dos attributes = No
      browseable = Yes
      blocking locks = Yes
      csc policy = manual
      fake oplocks = No
      locking = Yes
      oplocks = Yes
      level2 oplocks = Yes
      oplock contention limit = 2
      posix locking = Yes
      strict locking = Yes
      share modes = Yes
      copy =
      include =
      preexec =
      preexec close = No
      postexec =
      root preexec =
      root preexec close = No
      root postexec =
      available = Yes
      volume =
      fstype = NTFS
      set directory = No
      wide links = Yes
      follow symlinks = Yes
      dont descend =
      magic script =
      magic output =
      delete readonly = No
      dos filemode = No
      dos filetimes = Yes
      dos filetime resolution = No
      fake directory create times = No
      vfs objects =
      msdfs root = No
      msdfs proxy =

[main]
      path = /tmp
      printable = Yes

[winshare]
      path = /www/docs/atksales.com/jpg/winshare
      valid users = credit, henry, root, gary
      read only = No

[records]
      path = /usr2/record/
      valid users = henry, root, gary