diff --git a/src/lib/persisted_state.js b/src/lib/persisted_state.js
index a518cb519b..a47ad7d59b 100644
--- a/src/lib/persisted_state.js
+++ b/src/lib/persisted_state.js
@@ -1,7 +1,7 @@
 import merge from 'lodash.merge'
 import objectPath from 'object-path'
 import localforage from 'localforage'
-import { throttle } from 'lodash'
+import { throttle, each } from 'lodash'
 
 const defaultReducer = (state, paths) => (
   paths.length === 0 ? state : paths.reduce((substate, path) => {
@@ -33,6 +33,13 @@ export default function createPersistedState ({
   return store => {
     getState(key, storage).then((savedState) => {
       if (typeof savedState === 'object') {
+        // build user cache
+        const usersState = savedState.users || {}
+        usersState.usersObject = {}
+        const users = usersState.users || []
+        each(users, (user) => { usersState.usersObject[user.id] = user })
+        savedState.users = usersState
+
         store.replaceState(
           merge({}, store.state, savedState)
         )
diff --git a/src/modules/users.js b/src/modules/users.js
index 31731880d2..dc910c919e 100644
--- a/src/modules/users.js
+++ b/src/modules/users.js
@@ -3,9 +3,9 @@ import { compact, map, each, find, merge } from 'lodash'
 import { set } from 'vue'
 
 // TODO: Unify with mergeOrAdd in statuses.js
-export const mergeOrAdd = (arr, item) => {
+export const mergeOrAdd = (arr, obj, item) => {
   if (!item) { return false }
-  const oldItem = find(arr, {id: item.id})
+  const oldItem = obj[item.id]
   if (oldItem) {
     // We already have this, so only merge the new info.
     merge(oldItem, item)
@@ -13,6 +13,7 @@ export const mergeOrAdd = (arr, item) => {
   } else {
     // This is a new item, prepare it
     arr.push(item)
+    obj[item.id] = item
     return {item, new: true}
   }
 }
@@ -32,7 +33,7 @@ export const mutations = {
     state.loggingIn = false
   },
   addNewUsers (state, users) {
-    each(users, (user) => mergeOrAdd(state.users, user))
+    each(users, (user) => mergeOrAdd(state.users, state.usersObject, user))
   },
   setUserForStatus (state, status) {
     status.user = find(state.users, status.user)
@@ -42,7 +43,8 @@ export const mutations = {
 export const defaultState = {
   currentUser: false,
   loggingIn: false,
-  users: []
+  users: [],
+  usersObject: {}
 }
 
 const users = {