'searchUsers' executes slowly with ldapquery

there a lot of groups、members in my AD, when i debug code ,i find displayNamesInGroup execution takes too long，should we change this function, do not get all displayname then filter. i suggest change this ,
1.get groupdn by gid
2.get users by filter with -searchBase or groupdn

	 * get a list of all display names in a group
	 *
	 * @param string $gid
	 * @param string $search
	 * @param int $limit
	 * @param int $offset
	 * @return array an array of display names (value) and user ids (key)
	 */
	public function displayNamesInGroup($gid, $search = '', $limit = -1, $offset = 0) {
 		$group = $this->get($gid);
		if (is_null($group)) {
			return [];
		}

		$search = trim($search);
		$groupUsers = [];

		if (!empty($search)) {
			// only user backends have the capability to do a complex search for users
			$searchOffset = 0;
			$searchLimit = $limit * 100;
			if ($limit === -1) {
				$searchLimit = 500;
			}

			do {
				$filteredUsers = $this->userManager->searchDisplayName($search, $searchLimit, $searchOffset);
				foreach ($filteredUsers as $filteredUser) {
					if ($group->inGroup($filteredUser)) {
						$groupUsers[] = $filteredUser;
					}
				}
				$searchOffset += $searchLimit;
			} while (count($groupUsers) < $searchLimit + $offset && count($filteredUsers) >= $searchLimit);

			if ($limit === -1) {
				$groupUsers = array_slice($groupUsers, $offset);
			} else {
				$groupUsers = array_slice($groupUsers, $offset, $limit);
			}
		} else {
			$groupUsers = $group->searchUsers('', $limit, $offset);
		}

		$matchingUsers = [];
		foreach ($groupUsers as $groupUser) {
			$matchingUsers[(string) $groupUser->getUID()] = $groupUser->getDisplayName();
		}

		return $matchingUsers;
	}

Start from the displayNamesInGroup function shown in the issue and trace its get, searchDisplayName, inGroup, and searchUsers calls. Reproduce the slow path with a large Active Directory group, then verify that lookup filtering avoids fetching all display names while preserving search, limit, and offset behavior. No test file or source path is named in the issue.