diff --git a/lib/Command/CirclesSync.php b/lib/Command/CirclesSync.php
index 20e591a62..a90736550 100644
--- a/lib/Command/CirclesSync.php
+++ b/lib/Command/CirclesSync.php
@@ -138,6 +138,10 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 			return 0;
 		}
 
+		$output->writeln('<comment>This process requires a lot of memory.</comment>');
+		$output->writeln('<comment>If it crash, please restart it and it will continue where it stopped.</comment>');
+		$output->writeln('');
+
 		$sync = $this->filterSync($input);
 		$this->syncService->sync($sync);
 
diff --git a/lib/Db/AccountsRequest.php b/lib/Db/AccountsRequest.php
index 20557d98c..55c327b27 100644
--- a/lib/Db/AccountsRequest.php
+++ b/lib/Db/AccountsRequest.php
@@ -34,9 +34,29 @@ class AccountsRequest extends AccountsRequestBuilder {
 	use TStringTools;
 
 
+
+	public function getAccountData(string $userId): array {
+		$qb = $this->getAccountsSelectSql();
+
+		$this->limitToDBField($qb, 'uid', $userId);
+
+		$cursor = $qb->execute();
+		$data = $cursor->fetch();
+		$cursor->closeCursor();
+
+		if ($data === false) {
+			return [];
+		}
+
+		return $this->parseAccountsSelectSql($data);
+	}
+
+
+
 	/**
 	 * @param string $userId
 	 *
+	 * @deprecated
 	 * @return array
 	 * @throws MemberDoesNotExistException
 	 */
@@ -58,6 +78,7 @@ public function getFromUserId(string $userId): array {
 
 
 	/**
+	 * @deprecated
 	 * @return array
 	 */
 	public function getAll(): array {
diff --git a/lib/Search/LocalUsers.php b/lib/Search/LocalUsers.php
index b6f01b50e..83c6acf84 100644
--- a/lib/Search/LocalUsers.php
+++ b/lib/Search/LocalUsers.php
@@ -26,11 +26,11 @@
 
 namespace OCA\Circles\Search;
 
-use OCA\Circles\Tools\Traits\TArrayTools;
 use OCA\Circles\ISearch;
-use OCA\Circles\Model\DeprecatedMember;
+use OCA\Circles\Model\Member;
 use OCA\Circles\Model\SearchResult;
 use OCA\Circles\Service\ConfigService;
+use OCA\Circles\Tools\Traits\TArrayTools;
 use OCP\Collaboration\Collaborators\ISearch as ICollaboratorSearch;
 use OCP\Share\IShare;
 
@@ -51,7 +51,10 @@ class LocalUsers implements ISearch {
 	 * @param ICollaboratorSearch $search
 	 * @param ConfigService $configService
 	 */
-	public function __construct(ICollaboratorSearch $search, ConfigService $configService) {
+	public function __construct(
+		ICollaboratorSearch $search,
+		ConfigService $configService
+	) {
 		$this->search = $search;
 		$this->configService = $configService;
 	}
@@ -70,10 +73,12 @@ public function search($needle): array {
 
 		$users = $userManager->search($needle);
 		foreach ($users as $user) {
-			$result[] =
-				new SearchResult(
-					$user->getUID(), DeprecatedMember::TYPE_USER, '', ['display' => $user->getDisplayName()]
-				);
+			$result[] = new SearchResult(
+				$user->getUID(),
+				Member::TYPE_USER,
+				'',
+				['display' => $userManager->getDisplayName($user->getUID())]
+			);
 		}
 
 		return $result;
@@ -94,7 +99,7 @@ private function searchFromCollaborator($search): array {
 			$parsed[] =
 				new SearchResult(
 					$this->get('value.shareWith', $entry),
-					DeprecatedMember::TYPE_USER,
+					Member::TYPE_USER,
 					'',
 					['display' => $this->get('label', $entry)]
 				);
diff --git a/lib/Service/FederatedUserService.php b/lib/Service/FederatedUserService.php
index 7a30e81f7..8aec3be57 100644
--- a/lib/Service/FederatedUserService.php
+++ b/lib/Service/FederatedUserService.php
@@ -34,6 +34,7 @@
 use Exception;
 use OC;
 use OCA\Circles\AppInfo\Application;
+use OCA\Circles\Db\AccountsRequest;
 use OCA\Circles\Db\CircleRequest;
 use OCA\Circles\Db\MemberRequest;
 use OCA\Circles\Exceptions\CircleNotFoundException;
@@ -108,6 +109,9 @@ class FederatedUserService {
 	/** @var IUserManager */
 	private $userManager;
 
+	/** @var AccountsRequest */
+	private $accountRequest;
+
 	/** @var IGroupManager */
 	private $groupManager;
 
@@ -185,6 +189,7 @@ public function __construct(
 		ICacheFactory $cacheFactory,
 		FederatedEventService $federatedEventService,
 		MembershipService $membershipService,
+		AccountsRequest $accountRequest,
 		CircleRequest $circleRequest,
 		MemberRequest $memberRequest,
 		RemoteService $remoteService,
@@ -198,6 +203,7 @@ public function __construct(
 		$this->groupManager = $groupManager;
 		$this->federatedEventService = $federatedEventService;
 		$this->membershipService = $membershipService;
+		$this->accountRequest = $accountRequest;
 		$this->circleRequest = $circleRequest;
 		$this->memberRequest = $memberRequest;
 		$this->remoteService = $remoteService;
@@ -517,20 +523,24 @@ public function hasRemoteInstance(): bool {
 	 * @throws RequestBuilderException
 	 * @throws SingleCircleNotFoundException
 	 */
-	public function getLocalFederatedUser(string $userId, bool $check = true): FederatedUser {
+	public function getLocalFederatedUser(string $userId, bool $check = true, bool $generate = false): FederatedUser {
 		$displayName = $userId;
 		if ($check) {
 			$user = $this->userManager->get($userId);
 			if ($user === null) {
 				throw new FederatedUserNotFoundException('user ' . $userId . ' not found');
 			}
-			$userId = $user->getUID();
-			$displayName = $user->getDisplayName();
+			$displayName = $this->userManager->getDisplayName($userId);
+		} else {
+			$accountData = $this->accountRequest->getAccountData($userId);
+			if (array_key_exists('displayName', $accountData)) {
+				$displayName = $accountData['displayName'];
+			}
 		}
 
 		$federatedUser = new FederatedUser();
 		$federatedUser->set($userId, '', Member::TYPE_USER, $displayName);
-		$this->fillSingleCircleId($federatedUser, $check);
+		$this->fillSingleCircleId($federatedUser, ($check || $generate));
 
 		return $federatedUser;
 	}
diff --git a/lib/Service/MaintenanceService.php b/lib/Service/MaintenanceService.php
index 70edcb7d0..a96f24b24 100644
--- a/lib/Service/MaintenanceService.php
+++ b/lib/Service/MaintenanceService.php
@@ -32,6 +32,7 @@
 namespace OCA\Circles\Service;
 
 use Exception;
+use OCA\Circles\Db\AccountsRequest;
 use OCA\Circles\Db\CircleRequest;
 use OCA\Circles\Db\MemberRequest;
 use OCA\Circles\Db\ShareWrapperRequest;
@@ -56,7 +57,6 @@
 class MaintenanceService {
 	use TNCLogger;
 
-
 	public const TIMEOUT = 18000;
 
 	public static $DELAY =
@@ -75,6 +75,9 @@ class MaintenanceService {
 	/** @var IGroupManager */
 	private $groupManager;
 
+	/** @var AccountsRequest */
+	private $accountRequest;
+
 	/** @var CircleRequest */
 	private $circleRequest;
 
@@ -129,6 +132,7 @@ public function __construct(
 		IUserManager $userManager,
 		IGroupManager $groupManager,
 		CircleRequest $circleRequest,
+		AccountsRequest $accountRequest,
 		MemberRequest $memberRequest,
 		ShareWrapperRequest $shareWrapperRequest,
 		SyncService $syncService,
@@ -142,6 +146,7 @@ public function __construct(
 		$this->userManager = $userManager;
 		$this->groupManager = $groupManager;
 		$this->circleRequest = $circleRequest;
+		$this->accountRequest = $accountRequest;
 		$this->memberRequest = $memberRequest;
 		$this->shareWrapperRequest = $shareWrapperRequest;
 		$this->syncService = $syncService;
@@ -421,9 +426,11 @@ private function refreshDisplayName(bool $forceRefresh = false): void {
 			}
 
 			if ($owner->getUserType() === Member::TYPE_USER) {
-				$user = $this->userManager->get($owner->getUserId());
-				$this->memberRequest->updateDisplayName($owner->getSingleId(), $user->getDisplayName());
-				$this->circleRequest->updateDisplayName($owner->getSingleId(), $user->getDisplayName());
+				$accountData = $this->accountRequest->getAccountData($owner->getUserId());
+				if (array_key_exists('displayName', $accountData)) {
+					$this->memberRequest->updateDisplayName($owner->getSingleId(), $accountData['displayName']);
+					$this->circleRequest->updateDisplayName($owner->getSingleId(), $accountData['displayName']);
+				}
 			}
 		}
 	}
diff --git a/lib/Service/SyncService.php b/lib/Service/SyncService.php
index daca4668f..c29e4fde1 100644
--- a/lib/Service/SyncService.php
+++ b/lib/Service/SyncService.php
@@ -31,8 +31,6 @@
 
 namespace OCA\Circles\Service;
 
-use OCA\Circles\Tools\Traits\TNCLogger;
-use OCA\Circles\Tools\Traits\TStringTools;
 use Exception;
 use OCA\Circles\AppInfo\Application;
 use OCA\Circles\Db\CircleRequest;
@@ -61,6 +59,8 @@
 use OCA\Circles\Model\FederatedUser;
 use OCA\Circles\Model\ManagedModel;
 use OCA\Circles\Model\Member;
+use OCA\Circles\Tools\Traits\TNCLogger;
+use OCA\Circles\Tools\Traits\TStringTools;
 use OCP\IGroupManager;
 use OCP\IUserManager;
 
@@ -248,7 +248,7 @@ public function syncNextcloudUsers(): void {
 	public function syncNextcloudUser(string $userId): FederatedUser {
 		$this->outputService->output('Syncing Nextcloud Account \'' . $userId . '\'', true);
 
-		return $this->federatedUserService->getLocalFederatedUser($userId);
+		return $this->federatedUserService->getLocalFederatedUser($userId, false, true);
 	}
 
 
@@ -293,9 +293,21 @@ public function syncNextcloudGroup(string $groupId): Circle {
 		$this->outputService->output('Syncing Nextcloud Group \'' . $groupId . '\'', true);
 
 		$circle = $this->federatedUserService->getGroupCircle($groupId);
+		$members = array_map(function (Member $member): string {
+			return $member->getSingleId();
+		}, $this->memberRequest->getMembers($circle->getSingleId()));
+
 		$group = $this->groupManager->get($groupId);
+		if ($group->count() <= count($members)) {
+			return $circle;
+		}
+
 		foreach ($group->getUsers() as $user) {
 			$member = $this->generateGroupMember($circle, $user->getUID());
+			if (in_array($member->getSingleId(), $members)) {
+				continue;
+			}
+
 			$event = new FederatedEvent(SingleMemberAdd::class);
 			$event->setCircle($circle);
 			$event->setMember($member);
@@ -304,12 +316,8 @@ public function syncNextcloudGroup(string $groupId): Circle {
 				$this->federatedEventService->newEvent($event);
 			} catch (Exception $e) {
 			}
-
-//			$this->memberRequest->insertOrUpdate($member);
 		}
 
-//		$this->membershipService->onUpdate($circle->getSingleId());
-
 		return $circle;
 	}
 
@@ -452,10 +460,6 @@ public function groupMemberAdded(string $groupId, string $userId): void {
 		$event->setCircle($circle);
 		$event->setMember($member);
 		$this->federatedEventService->newEvent($event);
-
-//		$this->memberRequest->insertOrUpdate($member);
-
-//		$this->membershipService->onUpdate($member->getSingleId());
 	}