diff --git a/src/groups/leave.js b/src/groups/leave.js
index 32495232c9..f9af8a34ff 100644
--- a/src/groups/leave.js
+++ b/src/groups/leave.js
@@ -43,20 +43,20 @@ module.exports = function (Groups) {
 
 		const promises = [];
 		if (emptyPrivilegeGroups.length) {
-			promises.push(Groups.destroy, emptyPrivilegeGroups);
+			promises.push(Groups.destroy(emptyPrivilegeGroups));
 		}
 		if (visibleGroups.length) {
 			promises.push(
-				db.sortedSetAdd,
-				'groups:visible:memberCount',
-				visibleGroups.map(groupData => groupData.memberCount),
-				visibleGroups.map(groupData => groupData.name)
+				db.sortedSetAdd(
+					'groups:visible:memberCount',
+					visibleGroups.map(groupData => groupData.memberCount),
+					visibleGroups.map(groupData => groupData.name)
+				)
 			);
 		}
 
-		await Promise.all(promises);
-
 		await Promise.all([
+			...promises,
 			clearGroupTitleIfSet(groupsToLeave, uid),
 			leavePublicRooms(groupsToLeave, uid),
 		]);
@@ -82,7 +82,12 @@ module.exports = function (Groups) {
 	}
 
 	async function clearGroupTitleIfSet(groupNames, uid) {
-		groupNames = groupNames.filter(groupName => groupName !== 'registered-users' && !Groups.isPrivilegeGroup(groupName));
+		groupNames = groupNames.filter(
+			groupName => groupName !== 'registered-users' &&
+			groupName !== 'unverified-users' &&
+			groupName !== 'verified-users' &&
+			!Groups.isPrivilegeGroup(groupName)
+		);
 		if (!groupNames.length) {
 			return;
 		}
@@ -103,7 +108,9 @@ module.exports = function (Groups) {
 		const groups = await db.getSortedSetRange('groups:createtime', 0, -1);
 		await Promise.all([
 			Groups.leave(groups, uid),
-			Groups.rejectMembership(groups, uid),
+			Groups.rejectMembership(
+				groups.filter(g => !Groups.isPrivilegeGroup(g)), uid
+			),
 		]);
 	};
 
diff --git a/src/messaging/rooms.js b/src/messaging/rooms.js
index 4356775a47..50a252fc0d 100644
--- a/src/messaging/rooms.js
+++ b/src/messaging/rooms.js
@@ -361,9 +361,11 @@ module.exports = function (Messaging) {
 	};
 
 	Messaging.leaveRooms = async (uid, roomIds) => {
-		const isInRoom = await Promise.all(roomIds.map(roomId => Messaging.isUserInRoom(uid, roomId)));
+		const isInRoom = await Messaging.isUserInRoom(uid, roomIds);
 		roomIds = roomIds.filter((roomId, index) => isInRoom[index]);
-
+		if (!roomIds.length) {
+			return;
+		}
 		const roomKeys = [
 			...roomIds.map(roomId => `chat:room:${roomId}:uids`),
 			...roomIds.map(roomId => `chat:room:${roomId}:owners`),
diff --git a/src/user/delete.js b/src/user/delete.js
index 17ae717490..12cdbb588d 100644
--- a/src/user/delete.js
+++ b/src/user/delete.js
@@ -33,10 +33,15 @@ module.exports = function (User) {
 			throw new Error('[[error:already-deleting]]');
 		}
 		deletesInProgress[uid] = 'user.delete';
-		await deletePosts(callerUid, uid);
-		await deleteTopics(callerUid, uid);
-		await deleteUploads(callerUid, uid);
-		await deleteQueued(uid);
+		async function deletePostsTopics() {
+			await deletePosts(callerUid, uid);
+			await deleteTopics(callerUid, uid);
+		}
+		await Promise.all([
+			deletePostsTopics(),
+			deleteUploads(callerUid, uid),
+			deleteQueued(uid),
+		]);
 		delete deletesInProgress[uid];
 	};
 
@@ -90,9 +95,9 @@ module.exports = function (User) {
 			throw new Error('[[error:already-deleting]]');
 		}
 		deletesInProgress[uid] = 'user.deleteAccount';
-
+		const isLocal = utils.isNumber(uid);
 		await removeFromSortedSets(uid);
-		const userData = await db.getObject(utils.isNumber(uid) ? `user:${uid}` : `userRemote:${uid}`);
+		const userData = await db.getObject(isLocal ? `user:${uid}` : `userRemote:${uid}`);
 
 		if (!userData || !userData.username) {
 			delete deletesInProgress[uid];
@@ -100,9 +105,11 @@ module.exports = function (User) {
 		}
 
 		await plugins.hooks.fire('static:user.delete', { uid: uid, userData: userData });
-		await deleteVotes(uid);
-		await deleteChats(uid);
-		await User.auth.revokeAllSessions(uid);
+		await Promise.all([
+			deleteVotes(uid),
+			deleteChats(uid),
+			User.auth.revokeAllSessions(uid),
+		]);
 
 		const keys = [
 			`uid:${uid}:notifications:read`,
@@ -143,7 +150,7 @@ module.exports = function (User) {
 
 		await Promise.all([
 			db.sortedSetRemoveBulk(bulkRemove),
-			utils.isNumber(uid) ? db.decrObjectField('global', 'userCount') : null,
+			isLocal ? db.decrObjectField('global', 'userCount') : null,
 			db.deleteAll(keys),
 			db.setRemove('invitation:uids', uid),
 			deleteUserIps(uid),
@@ -156,13 +163,13 @@ module.exports = function (User) {
 			flags.resolveFlag('user', uid, uid),
 			User.reset.cleanByUid(uid),
 			User.email.expireValidation(uid),
-			activitypub.actors.remove(uid),
+			!isLocal ? activitypub.actors.remove(uid) : null,
 		]);
 		await db.deleteAll([
 			`followers:${uid}`, `following:${uid}`,
 			`uid:${uid}:followed_tags`, `uid:${uid}:followed_tids`,
 			`uid:${uid}:ignored_tids`,
-			`${utils.isNumber(uid) ? 'user' : 'userRemote'}:${uid}`,
+			`${isLocal ? 'user' : 'userRemote'}:${uid}`,
 		]);
 		delete deletesInProgress[uid];
 		return userData;
@@ -184,11 +191,10 @@ module.exports = function (User) {
 	}
 
 	async function deleteVotes(uid) {
-		const [upvotedPids, downvotedPids] = await Promise.all([
-			db.getSortedSetRange(`uid:${uid}:upvote`, 0, -1),
-			db.getSortedSetRange(`uid:${uid}:downvote`, 0, -1),
-		]);
-		const pids = _.uniq(upvotedPids.concat(downvotedPids).filter(Boolean));
+		const upvoteDownvotePids = await db.getSortedSetRange([
+			`uid:${uid}:upvote`, `uid:${uid}:downvote`,
+		], 0, -1);
+		const pids = _.uniq(upvoteDownvotePids).filter(Boolean);
 		await async.eachSeries(pids, async (pid) => {
 			await posts.unvote(pid, uid);
 		});
@@ -203,8 +209,10 @@ module.exports = function (User) {
 
 	async function deleteUserIps(uid) {
 		const ips = await db.getSortedSetRange(`uid:${uid}:ip`, 0, -1);
-		await db.sortedSetsRemove(ips.map(ip => `ip:${ip}:uid`), uid);
-		await db.delete(`uid:${uid}:ip`);
+		await Promise.all([
+			db.sortedSetsRemove(ips.map(ip => `ip:${ip}:uid`), uid),
+			db.delete(`uid:${uid}:ip`),
+		]);
 	}
 
 	async function deleteUserFromFollowers(uid) {