diff --git a/src/categories/topics.js b/src/categories/topics.js
index a9e3ab1229..fc0a8cb5fd 100644
--- a/src/categories/topics.js
+++ b/src/categories/topics.js
@@ -209,10 +209,14 @@ module.exports = function (Categories) {
 
 		async.parallel([
 			function (next) {
-				db.sortedSetAdd('cid:' + cid + ':pids', postData.timestamp, postData.pid, next);
-			},
-			function (next) {
-				db.sortedSetAdd('cid:' + cid + ':tids:lastposttime', postData.timestamp, postData.tid, next);
+				const bulk = [
+					['cid:' + cid + ':pids', postData.timestamp, postData.pid],
+					['cid:' + cid + ':tids:lastposttime', postData.timestamp, postData.tid],
+				];
+				if (!pinned) {
+					bulk.push(['cid:' + cid + ':tids', postData.timestamp, postData.tid]);
+				}
+				db.sortedSetAddBulk(bulk, next);
 			},
 			function (next) {
 				db.incrObjectField('category:' + cid, 'post_count', next);
@@ -221,17 +225,7 @@ module.exports = function (Categories) {
 				if (pinned) {
 					return setImmediate(next);
 				}
-
-				async.parallel([
-					function (next) {
-						db.sortedSetAdd('cid:' + cid + ':tids', postData.timestamp, postData.tid, next);
-					},
-					function (next) {
-						db.sortedSetIncrBy('cid:' + cid + ':tids:posts', 1, postData.tid, next);
-					},
-				], function (err) {
-					next(err);
-				});
+				db.sortedSetIncrBy('cid:' + cid + ':tids:posts', 1, postData.tid, err => next(err));
 			},
 			function (next) {
 				Categories.updateRecentTid(cid, postData.tid, next);
diff --git a/src/categories/update.js b/src/categories/update.js
index a1ca3cc01f..c89590c742 100644
--- a/src/categories/update.js
+++ b/src/categories/update.js
@@ -150,22 +150,12 @@ module.exports = function (Categories) {
 				Categories.getCategoryField(cid, 'parentCid', next);
 			},
 			function (parentCid, next) {
-				async.parallel([
-					function (next) {
-						db.sortedSetAdd('categories:cid', order, cid, next);
-					},
-					function (next) {
-						db.sortedSetAdd('cid:' + parentCid + ':children', order, cid, next);
-					},
-					function (next) {
-						cache.del(['categories:cid', 'cid:' + parentCid + ':children']);
-						next();
-					},
-				], next);
+				db.sortedSetsAdd(['categories:cid', 'cid:' + parentCid + ':children'], order, cid, function (err) {
+					cache.del(['categories:cid', 'cid:' + parentCid + ':children']);
+					next(err);
+				});
 			},
-		], function (err) {
-			callback(err);
-		});
+		], err => callback(err));
 	}
 
 	Categories.parseDescription = function (cid, description, callback) {
diff --git a/src/database/mongo/sorted/remove.js b/src/database/mongo/sorted/remove.js
index ab4fd90b33..d8ca5af2cb 100644
--- a/src/database/mongo/sorted/remove.js
+++ b/src/database/mongo/sorted/remove.js
@@ -18,15 +18,10 @@ module.exports = function (db, module) {
 			value = helpers.valueToString(value);
 		}
 
-		if (Array.isArray(key) && Array.isArray(value)) {
-			db.collection('objects').deleteMany({ _key: { $in: key }, value: { $in: value } }, done);
-		} else if (Array.isArray(value)) {
-			db.collection('objects').deleteMany({ _key: key, value: { $in: value } }, done);
-		} else if (Array.isArray(key)) {
-			db.collection('objects').deleteMany({ _key: { $in: key }, value: value }, done);
-		} else {
-			db.collection('objects').deleteOne({ _key: key, value: value }, done);
-		}
+		db.collection('objects').deleteMany({
+			_key: Array.isArray(key) ? { $in: key } : key,
+			value: Array.isArray(value) ? { $in: value } : value,
+		}, done);
 	};
 
 	module.sortedSetsRemove = function (keys, value, callback) {
diff --git a/src/groups/update.js b/src/groups/update.js
index 3dd68c97c6..31efd9a187 100644
--- a/src/groups/update.js
+++ b/src/groups/update.js
@@ -88,8 +88,7 @@ module.exports = function (Groups) {
 	function updateVisibility(groupName, hidden, callback) {
 		if (hidden) {
 			async.parallel([
-				async.apply(db.sortedSetRemove, 'groups:visible:createtime', groupName),
-				async.apply(db.sortedSetRemove, 'groups:visible:memberCount', groupName),
+				async.apply(db.sortedSetsRemove, ['groups:visible:createtime', 'groups:visible:memberCount'], groupName),
 				async.apply(db.sortedSetRemove, 'groups:visible:name', groupName.toLowerCase() + ':' + groupName),
 			], callback);
 		} else {
@@ -98,10 +97,10 @@ module.exports = function (Groups) {
 					db.getObjectFields('group:' + groupName, ['createtime', 'memberCount'], next);
 				},
 				function (groupData, next) {
-					async.parallel([
-						async.apply(db.sortedSetAdd, 'groups:visible:createtime', groupData.createtime, groupName),
-						async.apply(db.sortedSetAdd, 'groups:visible:memberCount', groupData.memberCount, groupName),
-						async.apply(db.sortedSetAdd, 'groups:visible:name', 0, groupName.toLowerCase() + ':' + groupName),
+					db.sortedSetAddBulk([
+						['groups:visible:createtime', groupData.createtime, groupName],
+						['groups:visible:memberCount', groupData.memberCount, groupName],
+						['groups:visible:name', 0, groupName.toLowerCase() + ':' + groupName],
 					], next);
 				},
 			], callback);
diff --git a/src/install.js b/src/install.js
index e93b83bdd7..64f354521f 100644
--- a/src/install.js
+++ b/src/install.js
@@ -527,9 +527,7 @@ function enableDefaultPlugins(next) {
 	winston.info('[install/enableDefaultPlugins] activating default plugins', defaultEnabled);
 
 	var db = require('./database');
-	var order = defaultEnabled.map(function (plugin, index) {
-		return index;
-	});
+	var order = defaultEnabled.map((plugin, index) => index);
 	db.sortedSetAdd('plugins:active', order, defaultEnabled, next);
 }
 
diff --git a/src/messaging/rooms.js b/src/messaging/rooms.js
index 50084dd314..eb055a120d 100644
--- a/src/messaging/rooms.js
+++ b/src/messaging/rooms.js
@@ -124,10 +124,8 @@ module.exports = function (Messaging) {
 				if (!inRoom) {
 					return next(new Error('[[error:cant-add-users-to-chat-room]]'));
 				}
-				var now = Date.now();
-				var timestamps = uids.map(function () {
-					return now;
-				});
+				const now = Date.now();
+				const timestamps = uids.map(() => now);
 				db.sortedSetAdd('chat:room:' + roomId + ':uids', timestamps, uids, next);
 			},
 			function (next) {
diff --git a/src/notifications.js b/src/notifications.js
index 87b5a79f85..19fb157d2a 100644
--- a/src/notifications.js
+++ b/src/notifications.js
@@ -108,10 +108,7 @@ Notifications.filterExists = function (nids, callback) {
 			db.isSortedSetMembers('notifications', nids, next);
 		},
 		function (exists, next) {
-			nids = nids.filter(function (notifId, idx) {
-				return exists[idx];
-			});
-
+			nids = nids.filter((notifId, idx) => exists[idx]);
 			next(null, nids);
 		},
 	], callback);
@@ -397,52 +394,32 @@ Notifications.markReadMultiple = function (nids, uid, callback) {
 		return callback();
 	}
 
-	var notificationKeys = nids.map(function (nid) {
-		return 'notifications:' + nid;
-	});
+	let notificationKeys = nids.map(nid => 'notifications:' + nid);
 
 	async.waterfall([
 		async.apply(db.getObjectsFields, notificationKeys, ['mergeId']),
 		function (mergeIds, next) {
 			// Isolate mergeIds and find related notifications
-			mergeIds = mergeIds.map(function (set) {
-				return set.mergeId;
-			}).reduce(function (memo, mergeId, idx, arr) {
-				if (mergeId && idx === arr.indexOf(mergeId)) {
-					memo.push(mergeId);
-				}
-				return memo;
-			}, []);
+			mergeIds = _.uniq(mergeIds.map(set => set.mergeId));
 
 			Notifications.findRelated(mergeIds, 'uid:' + uid + ':notifications:unread', next);
 		},
 		function (relatedNids, next) {
-			notificationKeys = _.union(nids, relatedNids).map(function (nid) {
-				return 'notifications:' + nid;
-			});
+			notificationKeys = _.union(nids, relatedNids).map(nid => 'notifications:' + nid);
 
 			db.getObjectsFields(notificationKeys, ['nid', 'datetime'], next);
 		},
 		function (notificationData, next) {
-			// Filter out notifications that didn't exist
-			notificationData = notificationData.filter(function (notification) {
-				return notification && notification.nid;
-			});
+			notificationData = notificationData.filter(n => n && n.nid);
 
-			// Extract nid
-			nids = notificationData.map(function (notification) {
-				return notification.nid;
-			});
-
-			var datetimes = notificationData.map(function (notification) {
-				return (notification && notification.datetime) || Date.now();
-			});
+			nids = notificationData.map(n => n.nid);
 
 			async.parallel([
 				function (next) {
 					db.sortedSetRemove('uid:' + uid + ':notifications:unread', nids, next);
 				},
 				function (next) {
+					const datetimes = notificationData.map(n => (n && n.datetime) || Date.now());
 					db.sortedSetAdd('uid:' + uid + ':notifications:read', datetimes, nids, next);
 				},
 			], next);
@@ -465,12 +442,11 @@ Notifications.markAllRead = function (uid, callback) {
 
 Notifications.prune = function (callback) {
 	callback = callback || function () {};
-	var week = 604800000;
-
-	var cutoffTime = Date.now() - week;
 
 	async.waterfall([
 		function (next) {
+			const week = 604800000;
+			const cutoffTime = Date.now() - week;
 			db.getSortedSetRangeByScore('notifications', 0, 500, '-inf', cutoffTime, next);
 		},
 		function (nids, next) {
@@ -478,15 +454,12 @@ Notifications.prune = function (callback) {
 				return callback();
 			}
 
-			var keys = nids.map(function (nid) {
-				return 'notifications:' + nid;
-			});
-
 			async.parallel([
 				function (next) {
 					db.sortedSetRemove('notifications', nids, next);
 				},
 				function (next) {
+					const keys = nids.map(nid => 'notifications:' + nid);
 					db.deleteAll(keys, next);
 				},
 			], next);
diff --git a/src/topics/delete.js b/src/topics/delete.js
index b8b6236b4a..eddeabb8c6 100644
--- a/src/topics/delete.js
+++ b/src/topics/delete.js
@@ -68,13 +68,11 @@ module.exports = function (Topics) {
 						Topics.updateRecent(tid, topicData.lastposttime, next);
 					},
 					function (next) {
-						db.sortedSetAdd('topics:posts', topicData.postcount, tid, next);
-					},
-					function (next) {
-						db.sortedSetAdd('topics:views', topicData.viewcount, tid, next);
-					},
-					function (next) {
-						db.sortedSetAdd('topics:votes', parseInt(topicData.votes, 10) || 0, tid, next);
+						db.sortedSetAddBulk([
+							['topics:posts', topicData.postcount, tid],
+							['topics:views', topicData.viewcount, tid],
+							['topics:votes', parseInt(topicData.votes, 10) || 0, tid],
+						], next);
 					},
 					function (next) {
 						async.waterfall([
diff --git a/src/topics/tools.js b/src/topics/tools.js
index 0274e102fa..2435c97fdd 100644
--- a/src/topics/tools.js
+++ b/src/topics/tools.js
@@ -188,15 +188,11 @@ module.exports = function (Topics) {
 						} else {
 							async.parallel([
 								async.apply(db.sortedSetRemove, 'cid:' + topicData.cid + ':tids:pinned', tid),
-								async.apply(db.sortedSetsAdd, [
-									'cid:' + topicData.cid + ':tids',
-									'cid:' + topicData.cid + ':tids:posts',
-									'cid:' + topicData.cid + ':tids:votes',
-								], [
-									topicData.lastposttime,
-									topicData.postcount,
-									parseInt(topicData.votes, 10) || 0,
-								], tid),
+								async.apply(db.sortedSetAddBulk, [
+									['cid:' + topicData.cid + ':tids', topicData.lastposttime, tid],
+									['cid:' + topicData.cid + ':tids:posts', topicData.postcount, tid],
+									['cid:' + topicData.cid + ':tids:votes', parseInt(topicData.votes, 10) || 0, tid],
+								]),
 							], next);
 						}
 					},
diff --git a/src/user/admin.js b/src/user/admin.js
index df07189d52..7c170016c3 100644
--- a/src/user/admin.js
+++ b/src/user/admin.js
@@ -14,18 +14,13 @@ module.exports = function (User) {
 			return setImmediate(callback);
 		}
 		var now = Date.now();
-		async.waterfall([
-			function (next) {
-				db.sortedSetAdd('uid:' + uid + ':ip', now, ip || 'Unknown', next);
-			},
-			function (next) {
-				if (ip) {
-					db.sortedSetAdd('ip:' + ip + ':uid', now, uid, next);
-				} else {
-					next();
-				}
-			},
-		], callback);
+		const bulk = [
+			['uid:' + uid + ':ip', now, ip || 'Unknown'],
+		];
+		if (ip) {
+			bulk.push(['ip:' + ip + ':uid', now, uid]);
+		}
+		db.sortedSetAddBulk(bulk, callback);
 	};
 
 	User.getIPs = function (uid, stop, callback) {
diff --git a/src/user/follow.js b/src/user/follow.js
index b3ec7fd969..50a011f111 100644
--- a/src/user/follow.js
+++ b/src/user/follow.js
@@ -40,8 +40,10 @@ module.exports = function (User) {
 					}
 					var now = Date.now();
 					async.parallel([
-						async.apply(db.sortedSetAdd, 'following:' + uid, now, theiruid),
-						async.apply(db.sortedSetAdd, 'followers:' + theiruid, now, uid),
+						async.apply(db.sortedSetAddBulk, [
+							['following:' + uid, now, theiruid],
+							['followers:' + theiruid, now, uid],
+						]),
 						async.apply(User.incrementUserFieldBy, uid, 'followingCount', 1),
 						async.apply(User.incrementUserFieldBy, theiruid, 'followerCount', 1),
 					], next);
diff --git a/src/user/profile.js b/src/user/profile.js
index c34fefa58f..cf621a91a6 100644
--- a/src/user/profile.js
+++ b/src/user/profile.js
@@ -206,13 +206,12 @@ module.exports = function (User) {
 			function (next) {
 				async.parallel([
 					function (next) {
-						db.sortedSetAdd('email:uid', uid, newEmail.toLowerCase(), next);
-					},
-					function (next) {
-						db.sortedSetAdd('email:sorted', 0, newEmail.toLowerCase() + ':' + uid, next);
-					},
-					function (next) {
-						db.sortedSetAdd('user:' + uid + ':emails', Date.now(), newEmail + ':' + Date.now(), next);
+						db.sortedSetAddBulk([
+							['email:uid', uid, newEmail.toLowerCase()],
+							['email:sorted', 0, newEmail.toLowerCase() + ':' + uid],
+							['user:' + uid + ':emails', Date.now(), newEmail + ':' + Date.now()],
+							['users:notvalidated', Date.now(), uid],
+						], next);
 					},
 					function (next) {
 						User.setUserField(uid, 'email', newEmail, next);
@@ -227,9 +226,6 @@ module.exports = function (User) {
 						}
 						User.setUserField(uid, 'email:confirmed', 0, next);
 					},
-					function (next) {
-						db.sortedSetAdd('users:notvalidated', Date.now(), uid, next);
-					},
 					function (next) {
 						User.reset.cleanByUid(uid, next);
 					},