[Samba] UI performance awful - please help!

[Jules Agee]

I've set up a Samba 2.2.5 server authenticating against an OpenLDAP 
server. Everything seems to be working, except that changing directories 
takes 15-30 seconds. I've set up nss_ldap, optimized the nscd cache and 
my LDAP server's cache and indexes, and both seem to respond instantly 
on the command line (for cache hits, anyway). If I connect with NET USE 
on a client machine, it works fine, no delays. Same with smbclient. The 
problem only seems to rear its head when using Windows Explorer. Every 
time I open a new folder in Windows Explorer, at log level 2 I can see 
anywhere from ten to thirty entries like this:

[2002/11/12 12:17:15, 2] lib/access.c:check_access(327)
   Allowed connection from  (199.249.215.249)
[2002/11/12 12:17:16, 2] lib/access.c:check_access(327)
   Allowed connection from  (199.249.215.249)
[2002/11/12 12:17:16, 2] lib/access.c:check_access(327)
   Allowed connection from  (199.249.215.249)

Here's my smb.conf file. Any suggestions would be greatly appreciated.

# Global parameters
[global]
         ldap server = localhost
         ldap port = 389
         ldap suffix = "o=internet"
         ldap admin dn = "cn=Manager,o=internet"
         ldap ssl = no
	workgroup = IS
	netbios name = THOR
	server string = Thor File Server
	max log size = 10000
	hosts allow = 199.249.215.0/255.255.255.0 10.0.0.0/255.0.0.0
	name resolve order = host bcast
	encrypt passwords = Yes
	group = default
	create mask = 770
	directory mask = 0770
	log level = 2
	log file = /var/log/samba/%m.log
	delete veto files = yes
	veto files = /.AppleDouble/.AppleDesktop/Network Trash 
Folder/TheVolumeSettingsFolder/Icon?/TheFindByContentFolder/

[private]
	comment = Private File Storage/Backup
	directory mask = 0700
	path = /usr/local/fileshare/home
	read only = No

[public]
	comment = Public File Sharing
	path = /usr/local/fileshare/public
	create mask = 777
	directory mask = 0777
	read only = No
	guest ok = Yes

[artdept-web]
	comment = artdept Intranet
	path = /usr/local/fileshare/artdept-web
	create mask = 774
	directory mask = 0775
	read only = No
	group = ArtDept
	valid users = @ArtDept

[hr-web]
	comment = humanresources Intranet
	path = /usr/local/fileshare/hr-web
	create mask = 774
	directory mask = 0775
	read only = No
	group = HumanResources
	valid users = @HumanResources

[IS]
	comment = Information Systems
	path = /usr/local/fileshare/IS
	read only = No
	group = IS
	valid users = @IS, at SysAdmin, at ISAnalysts, at SupportAnalysts