diff --git a/openmetadata-service/src/main/java/org/openmetadata/service/security/auth/LdapAuthenticator.java b/openmetadata-service/src/main/java/org/openmetadata/service/security/auth/LdapAuthenticator.java
index edad29c4f26d..32ff88bcabaa 100644
--- a/openmetadata-service/src/main/java/org/openmetadata/service/security/auth/LdapAuthenticator.java
+++ b/openmetadata-service/src/main/java/org/openmetadata/service/security/auth/LdapAuthenticator.java
@@ -162,8 +162,16 @@ private User checkAndCreateUser(String userDn, String email, String userName) th
 
     // Check if the user exists in OM Database
     try {
-      User omUser =
-          userRepository.getByEmail(null, email, userRepository.getFields("id,name,email,roles"));
+      // Load the same field set the PUT path uses (USER_UPDATE_FIELDS): roles, teams,
+      // profile, authenticationMechanism, isEmailVerified, personas, defaultPersona,
+      // domains, personaPreferences. UserUpdater.entitySpecificUpdate runs updateTeams /
+      // updatePersonas / etc. unconditionally; with a sparse fetch those fields arrive
+      // null and the updater wipes the corresponding relationships, which destroys the
+      // user's manually-assigned teams on every LDAP login and makes login slow (deleteTo
+      // does work proportional to the user's existing team count). Use getPutFields()
+      // (narrow) rather than getFieldsWithUserAuth("*") (wide) so we don't eagerly load
+      // the heavy owns/follows relationship sets on every login.
+      User omUser = userRepository.getByEmail(null, email, userRepository.getPutFields());
       getRoleForLdap(userDn, omUser, Boolean.TRUE);
       finalUser = omUser;
     } catch (EntityNotFoundException ex) {