Index: umc/python/udm/udm_ldap.py
===================================================================
--- umc/python/udm/udm_ldap.py	(Revision 40433)
+++ umc/python/udm/udm_ldap.py	(Arbeitskopie)
@@ -1065,32 +1065,40 @@
 
 	if issubclass( syn.__class__, udm_syntax.UDM_Objects ):
 		syn.choices = []
+		def extract_key_label(syn, dn, info):
+			key = label = None
+			if syn.key == 'dn':
+				key = dn
+			else:
+				try:
+					key = syn.key % info
+				except KeyError:
+					pass
+			if syn.label == 'dn':
+				label = dn
+			elif syn.label is None:
+				pass
+			else:
+				try:
+					label = syn.label % info
+				except KeyError:
+					pass
+			return key, label
 		def map_choices( obj_list ):
 			result = []
 			for obj in obj_list:
-				obj.open()
-
-				if syn.key == 'dn':
-					key = obj.dn
-				else:
-					try:
-						key = syn.key % obj.info
-					except KeyError:
+				key, label = extract_key_label(syn, obj.dn, obj.info)
+				if key is None or label is None:
+					obj.open()
+					key, label = extract_key_label(syn, obj.dn, obj.info)
+					if key is None:
 						# ignore the entry as the key is important for a selection, there
 						# is no sensible fallback for the key (Bug #26994)
 						continue
-				if syn.label is None:
-					label = udm_objects.description( obj )
-				elif syn.label == 'dn':
-					label = obj.dn
-				else:
-					try:
-						label = syn.label % obj.info
-					except KeyError:
+					if label is None:
 						# fallback to the default description as this is just what displayed
 						# to the user (Bug #26994)
 						label = udm_objects.description( obj )
-
 				result.append( (key, label) )
 			return result
 
Index: modules/univention/admin/handlers/shares/share.py
===================================================================
--- modules/univention/admin/handlers/shares/share.py	(Revision 40433)
+++ modules/univention/admin/handlers/shares/share.py	(Arbeitskopie)
@@ -827,6 +827,10 @@
 			if 'univentionShareNFS' in self.oldattr['objectClass']:
 				self.options.append( 'nfs' )
 			try:
+				# ATTENTION: syntax nfsShare wants to use
+				#   %(printablename)s as label but we changed that because
+				#   of lookup performance reasons. If you change printablename
+				#   here, you probably want to change the label of the syntax, too.
 				self['printablename'] = "%s (%s)" % (self['name'], self['host'])
 			except:
 				pass
@@ -900,7 +904,6 @@
 		if not hasattr(self,"options"):
 			self.open()
 		if 'nfs' in self.options:
-			ulist=[]
 			searchstring="*"+self['host']+":"+self['path']+"*"
 			searchResult=self.lo.searchDn(base=self.position.getDomain(), filter='(&(objectClass=person)(automountInformation=%s))'%searchstring, scope='domain')
 			if searchResult:
Index: modules/univention/admin/de.po
===================================================================
--- modules/univention/admin/de.po	(Revision 40433)
+++ modules/univention/admin/de.po	(Arbeitskopie)
@@ -221,6 +221,10 @@
 msgid "cannot find fqdn of "
 msgstr "FQDN konnte nicht gefunden werden: "
 
+#: syntax.py:1743
+msgid "%(name)s (%(path)s on %(host)s)"
+msgstr "%(name)s (%(path)s auf %(host)s)"
+
 #: syntax.py:109 syntax.py:162 syntax.py:298
 msgid "Invalid value"
 msgstr "Ungültiger Wert"
Index: modules/univention/admin/syntax.py
===================================================================
--- modules/univention/admin/syntax.py	(Revision 40433)
+++ modules/univention/admin/syntax.py	(Arbeitskopie)
@@ -1603,9 +1603,11 @@
 
 class GroupDN( UDM_Objects ):
 	udm_modules = ( 'groups/group', )
+	label = '%(name)s' # TODO: may be removed when UDM_Objects is able to extract from DN without initializing object
 
 class UserDN( UDM_Objects ):
 	udm_modules = ( 'users/user', )
+	label = '%(username)s' # TODO: may be removed when UDM_Objects is able to extract from DN without initializing object
 
 class HostDN( UDM_Objects ):
 	udm_modules = ( 'computers/computer', )
@@ -1687,12 +1689,14 @@
 class DNS_ForwardZone( UDM_Objects ):
  	description=_('DNS forward zone')
 	udm_modules = ( 'dns/forward_zone', )
+	label = '%(zone)s'
 	empty_value = True
 	size = 'TwoThirds'
 
 class DNS_ReverseZone( UDM_Objects ):
  	description=_('DNS reverse zone')
 	udm_modules = ( 'dns/reverse_zone', )
+	label = '%(subnet)s'
 	empty_value = True
 	size = 'TwoThirds'
 
@@ -1736,6 +1740,7 @@
 class WritableShare( UDM_Objects ):
 	udm_modules = ( 'shares/share', )
 	udm_filter = 'writeable=1'
+	label = _('%(name)s (%(path)s on %(host)s)') # ldap-optimized for shares/share.description()
 	size = 'OneAndAHalf'
 	empty_value = True
 
@@ -2551,7 +2556,7 @@
 class nfsShare(UDM_Objects):
 	udm_modules = ( 'shares/share', )
 	key = 'dn'
-	label = '%(printablename)s'
+	label = '%(name)s (%(host)s)' # ldap-optimized for '%(printablename)s'
 	udm_filter = 'objectClass=univentionShareNFS'
 
 class nfsMounts(complex):