General react performance improvements (#2796)

* General React performance improvements

* Cleaned up unused props/state in PermaLinkView and PostFocusView

18 files changed, 250 insertions, 222 deletions

diff --git a/webapp/components/channel_info_modal.jsx b/webapp/components/channel_info_modal.jsx
index 4c16dda90..d44df4056 100644
--- a/webapp/components/channel_info_modal.jsx
+++ b/webapp/components/channel_info_modal.jsx
@@ -9,6 +9,17 @@ import {Modal} from 'react-bootstrap';
 import React from 'react';
 
 export default class ChannelInfoModal extends React.Component {
+    shouldComponentUpdate(nextProps) {
+        if (nextProps.show !== this.props.show) {
+            return true;
+        }
+
+        if (!Utils.areObjectsEqual(nextProps.channel, this.props.channel)) {
+            return true;
+        }
+
+        return false;
+    }
     render() {
         let channel = this.props.channel;
         if (!channel) {
@@ -93,4 +104,4 @@ ChannelInfoModal.propTypes = {
     show: React.PropTypes.bool.isRequired,
     onHide: React.PropTypes.func.isRequired,
     channel: React.PropTypes.object.isRequired
-};
\ No newline at end of file
+};
diff --git a/webapp/components/channel_view.jsx b/webapp/components/channel_view.jsx
index 45d0f2393..6511d960a 100644
--- a/webapp/components/channel_view.jsx
+++ b/webapp/components/channel_view.jsx
@@ -11,6 +11,8 @@ import PostsViewContainer from 'components/posts_view_container.jsx';
 
 import ChannelStore from 'stores/channel_store.jsx';
 
+import * as Utils from 'utils/utils.jsx';
+
 export default class ChannelView extends React.Component {
     constructor(props) {
         super(props);
@@ -47,6 +49,17 @@ export default class ChannelView extends React.Component {
     componentWillReceiveProps(nextProps) {
         this.setState(this.getStateFromStores(nextProps));
     }
+    shouldComponentUpdate(nextProps, nextState) {
+        if (!Utils.areObjectsEqual(nextProps.params, this.props.params)) {
+            return true;
+        }
+
+        if (nextState.channelId !== this.state.channelId) {
+            return true;
+        }
+
+        return false;
+    }
     render() {
         return (
             <div
@@ -57,7 +70,7 @@ export default class ChannelView extends React.Component {
                 <ChannelHeader
                     channelId={this.state.channelId}
                 />
-                <PostsViewContainer profiles={this.props.profiles}/>
+                <PostsViewContainer/>
                 <div
                     className='post-create__container'
                     id='post-create'
@@ -72,6 +85,5 @@ ChannelView.defaultProps = {
 };
 
 ChannelView.propTypes = {
-    params: React.PropTypes.object.isRequired,
-    profiles: React.PropTypes.object
+    params: React.PropTypes.object.isRequired
 };
diff --git a/webapp/components/floating_timestamp.jsx b/webapp/components/floating_timestamp.jsx
new file mode 100644
index 000000000..8974c62c5
--- /dev/null
+++ b/webapp/components/floating_timestamp.jsx
@@ -0,0 +1,54 @@
+// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+import {FormattedDate} from 'react-intl';
+
+import React from 'react';
+import PureRenderMixin from 'react-addons-pure-render-mixin';
+
+export default class FloatingTimestamp extends React.Component {
+    constructor(props) {
+        super(props);
+
+        this.shouldComponentUpdate = PureRenderMixin.shouldComponentUpdate.bind(this);
+    }
+
+    render() {
+        if (!this.props.isMobile) {
+            return <noscript/>;
+        }
+
+        if (this.props.createAt === 0) {
+            return <noscript/>;
+        }
+
+        const dateString = (
+            <FormattedDate
+                value={this.props.createAt}
+                weekday='short'
+                day='2-digit'
+                month='short'
+                year='numeric'
+            />
+        );
+
+        let className = 'post-list__timestamp';
+        if (this.props.isScrolling) {
+            className += ' scrolling';
+        }
+
+        return (
+            <div className={className}>
+                <div>
+                    <span>{dateString}</span>
+                </div>
+            </div>
+        );
+    }
+}
+
+FloatingTimestamp.propTypes = {
+    isScrolling: React.PropTypes.bool.isRequired,
+    isMobile: React.PropTypes.bool,
+    createAt: React.PropTypes.number
+};
diff --git a/webapp/components/get_post_link_modal.jsx b/webapp/components/get_post_link_modal.jsx
index 4c56d4d64..cc01d1124 100644
--- a/webapp/components/get_post_link_modal.jsx
+++ b/webapp/components/get_post_link_modal.jsx
@@ -1,34 +1,25 @@
 // Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
 // See License.txt for license information.
 
-import Constants from 'utils/constants.jsx';
 import GetLinkModal from './get_link_modal.jsx';
 import ModalStore from 'stores/modal_store.jsx';
 import TeamStore from 'stores/team_store.jsx';
 
-import {intlShape, injectIntl, defineMessages} from 'react-intl';
-
-const holders = defineMessages({
-    title: {
-        id: 'get_post_link_modal.title',
-        defaultMessage: 'Copy Permalink'
-    },
-    help: {
-        id: 'get_post_link_modal.help',
-        defaultMessage: 'The link below allows authorized users to see your post.'
-    }
-});
+import * as Utils from 'utils/utils.jsx';
+import Constants from 'utils/constants.jsx';
 
 import React from 'react';
+import PureRenderMixin from 'react-addons-pure-render-mixin';
 
-class GetPostLinkModal extends React.Component {
+export default class GetPostLinkModal extends React.Component {
     constructor(props) {
         super(props);
 
         this.handleToggle = this.handleToggle.bind(this);
-
         this.hide = this.hide.bind(this);
 
+        this.shouldComponentUpdate = PureRenderMixin.shouldComponentUpdate.bind(this);
+
         this.state = {
             show: false,
             post: {}
@@ -57,22 +48,14 @@ class GetPostLinkModal extends React.Component {
     }
 
     render() {
-        const {formatMessage} = this.props.intl;
-
         return (
             <GetLinkModal
                 show={this.state.show}
                 onHide={this.hide}
-                title={formatMessage(holders.title)}
-                helpText={formatMessage(holders.help)}
+                title={Utils.localizeMessage('get_post_link_modal.title', 'Copy Permalink')}
+                helpText={Utils.localizeMessage('get_post_link_modal.help', 'The link below allows authorized users to see your post.')}
                 link={TeamStore.getCurrentTeamUrl() + '/pl/' + this.state.post.id}
             />
         );
     }
 }
-
-GetPostLinkModal.propTypes = {
-    intl: intlShape.isRequired
-};
-
-export default injectIntl(GetPostLinkModal);
diff --git a/webapp/components/get_team_invite_link_modal.jsx b/webapp/components/get_team_invite_link_modal.jsx
index 33cc065d1..109cb2120 100644
--- a/webapp/components/get_team_invite_link_modal.jsx
+++ b/webapp/components/get_team_invite_link_modal.jsx
@@ -1,36 +1,24 @@
 // Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
 // See License.txt for license information.
 
-import Constants from 'utils/constants.jsx';
 import GetLinkModal from './get_link_modal.jsx';
 import ModalStore from 'stores/modal_store.jsx';
 import TeamStore from 'stores/team_store.jsx';
 
-import {intlShape, injectIntl, defineMessages} from 'react-intl';
-
-const holders = defineMessages({
-    title: {
-        id: 'get_team_invite_link_modal.title',
-        defaultMessage: 'Team Invite Link'
-    },
-    help: {
-        id: 'get_team_invite_link_modal.help',
-        defaultMessage: 'Send teammates the link below for them to sign-up to this team site. The Team Invite Link can be shared with multiple teammates as it does not change unless it\'s regenerated in Team Settings by a Team Admin.'
-    },
-    helpDisabled: {
-        id: 'get_team_invite_link_modal.helpDisabled',
-        defaultMessage: 'User creation has been disabled for your team. Please ask your team administrator for details.'
-    }
-});
+import * as Utils from 'utils/utils.jsx';
+import Constants from 'utils/constants.jsx';
 
 import React from 'react';
+import PureRenderMixin from 'react-addons-pure-render-mixin';
 
-class GetTeamInviteLinkModal extends React.Component {
+export default class GetTeamInviteLinkModal extends React.Component {
     constructor(props) {
         super(props);
 
         this.handleToggle = this.handleToggle.bind(this);
 
+        this.shouldComponentUpdate = PureRenderMixin.shouldComponentUpdate.bind(this);
+
         this.state = {
             show: false
         };
@@ -51,28 +39,21 @@ class GetTeamInviteLinkModal extends React.Component {
     }
 
     render() {
-        const {formatMessage} = this.props.intl;
-
-        let helpText = formatMessage(holders.helpDisabled);
-
+        let helpText;
         if (global.window.mm_config.EnableUserCreation === 'true') {
-            helpText = formatMessage(holders.help);
+            helpText = Utils.localizeMessage('get_team_invite_link_modal.help', 'Send teammates the link below for them to sign-up to this team site. The Team Invite Link can be shared with multiple teammates as it does not change unless it\'s regenerated in Team Settings by a Team Admin.');
+        } else {
+            helpText = Utils.localizeMessage('get_team_invite_link_modal.helpDisabled', 'User creation has been disabled for your team. Please ask your team administrator for details.');
         }
 
         return (
             <GetLinkModal
                 show={this.state.show}
                 onHide={() => this.setState({show: false})}
-                title={formatMessage(holders.title)}
+                title={Utils.localizeMessage('get_team_invite_link_modal.title', 'Team Invite Link')}
                 helpText={helpText}
                 link={TeamStore.getCurrentInviteLink()}
             />
         );
     }
 }
-
-GetTeamInviteLinkModal.propTypes = {
-    intl: intlShape.isRequired
-};
-
-export default injectIntl(GetTeamInviteLinkModal);
diff --git a/webapp/components/more_channels.jsx b/webapp/components/more_channels.jsx
index 04c613ce5..087db68e6 100644
--- a/webapp/components/more_channels.jsx
+++ b/webapp/components/more_channels.jsx
@@ -2,17 +2,22 @@
 // See License.txt for license information.
 
 import $ from 'jquery';
-import ReactDOM from 'react-dom';
+import LoadingScreen from './loading_screen.jsx';
+import NewChannelFlow from './new_channel_flow.jsx';
+
+import ChannelStore from 'stores/channel_store.jsx';
+
 import * as Utils from 'utils/utils.jsx';
 import * as AsyncClient from 'utils/async_client.jsx';
 import * as GlobalActions from 'action_creators/global_actions.jsx';
-import ChannelStore from 'stores/channel_store.jsx';
-import LoadingScreen from './loading_screen.jsx';
-import NewChannelFlow from './new_channel_flow.jsx';
 
 import {FormattedMessage} from 'react-intl';
 import {browserHistory} from 'react-router';
 
+import React from 'react';
+import ReactDOM from 'react-dom';
+import PureRenderMixin from 'react-addons-pure-render-mixin';
+
 import loadingGif from 'images/load.gif';
 
 function getStateFromStores() {
@@ -22,8 +27,6 @@ function getStateFromStores() {
     };
 }
 
-import React from 'react';
-
 export default class MoreChannels extends React.Component {
     constructor(props) {
         super(props);
@@ -33,6 +36,8 @@ export default class MoreChannels extends React.Component {
         this.handleNewChannel = this.handleNewChannel.bind(this);
         this.createChannelRow = this.createChannelRow.bind(this);
 
+        this.shouldComponentUpdate = PureRenderMixin.shouldComponentUpdate.bind(this);
+
         var initState = getStateFromStores();
         initState.channelType = '';
         initState.joiningChannel = -1;
diff --git a/webapp/components/more_direct_channels.jsx b/webapp/components/more_direct_channels.jsx
index a83816c40..a7fb2b6cd 100644
--- a/webapp/components/more_direct_channels.jsx
+++ b/webapp/components/more_direct_channels.jsx
@@ -19,7 +19,6 @@ export default class MoreDirectChannels extends React.Component {
         this.handleHide = this.handleHide.bind(this);
         this.handleShowDirectChannel = this.handleShowDirectChannel.bind(this);
         this.handleUserChange = this.handleUserChange.bind(this);
-
         this.createJoinDirectChannelButton = this.createJoinDirectChannelButton.bind(this);
 
         this.state = {
@@ -52,6 +51,26 @@ export default class MoreDirectChannels extends React.Component {
         UserStore.removeChangeListener(this.handleUserChange);
     }
 
+    shouldComponentUpdate(nextProps, nextState) {
+        if (nextProps.show !== this.props.show) {
+            return true;
+        }
+
+        if (nextProps.onModalDismissed.toString() !== this.props.onModalDismissed.toString()) {
+            return true;
+        }
+
+        if (nextState.loadingDMChannel !== this.state.loadingDMChannel) {
+            return true;
+        }
+
+        if (!Utils.areObjectsEqual(nextState.users, this.state.users)) {
+            return true;
+        }
+
+        return false;
+    }
+
     handleHide() {
         if (this.props.onModalDismissed) {
             this.props.onModalDismissed();
diff --git a/webapp/components/needs_team.jsx b/webapp/components/needs_team.jsx
index 4aea8fe46..92c6fc0ce 100644
--- a/webapp/components/needs_team.jsx
+++ b/webapp/components/needs_team.jsx
@@ -42,20 +42,18 @@ export default class NeedsTeam extends React.Component {
         this.onChanged = this.onChanged.bind(this);
 
         this.state = {
-            profiles: UserStore.getProfiles(),
             team: TeamStore.getCurrent()
         };
     }
 
     onChanged() {
         this.setState({
-            profiles: UserStore.getProfiles(),
             team: TeamStore.getCurrent()
         });
     }
 
     componentWillMount() {
-        // Go to tutorial if we are first arrivign
+        // Go to tutorial if we are first arriving
         const tutorialStep = PreferenceStore.getInt(Preferences.TUTORIAL_STEP, UserStore.getCurrentId(), 999);
         if (tutorialStep <= TutorialSteps.INTRO_SCREENS) {
             browserHistory.push(Utils.getTeamURLNoOriginFromAddressBar() + '/tutorial');
@@ -63,7 +61,6 @@ export default class NeedsTeam extends React.Component {
     }
 
     componentDidMount() {
-        UserStore.addChangeListener(this.onChanged);
         TeamStore.addChangeListener(this.onChanged);
 
         // Emit view action
@@ -84,7 +81,6 @@ export default class NeedsTeam extends React.Component {
     }
 
     componentWillUnmount() {
-        UserStore.removeChangeListener(this.onChanged);
         TeamStore.removeChangeListener(this.onChanged);
         $(window).off('focus');
         $(window).off('blur');
@@ -114,7 +110,6 @@ export default class NeedsTeam extends React.Component {
                     <div className='row main'>
                         {React.cloneElement(this.props.center, {
                             user: this.props.user,
-                            profiles: this.state.profiles,
                             team: this.state.team
                         })}
                     </div>
diff --git a/webapp/components/permalink_view.jsx b/webapp/components/permalink_view.jsx
index 07f826d57..c2019cb49 100644
--- a/webapp/components/permalink_view.jsx
+++ b/webapp/components/permalink_view.jsx
@@ -70,7 +70,7 @@ export default class PermalinkView extends React.Component {
                 <ChannelHeader
                     channelId={this.state.channelId}
                 />
-                <PostFocusView profiles={this.props.profiles}/>
+                <PostFocusView/>
                 <div
                     id='archive-link-home'
                 >
@@ -89,10 +89,6 @@ export default class PermalinkView extends React.Component {
     }
 }
 
-PermalinkView.defaultProps = {
-};
-
 PermalinkView.propTypes = {
-    params: React.PropTypes.object.isRequired,
-    profiles: React.PropTypes.object
+    params: React.PropTypes.object.isRequired
 };
diff --git a/webapp/components/post_body.jsx b/webapp/components/post_body.jsx
index 884dbbbbb..a159dcbb1 100644
--- a/webapp/components/post_body.jsx
+++ b/webapp/components/post_body.jsx
@@ -10,24 +10,13 @@ import * as TextFormatting from 'utils/text_formatting.jsx';
 import twemoji from 'twemoji';
 import PostBodyAdditionalContent from './post_body_additional_content.jsx';
 
-import {intlShape, injectIntl, defineMessages, FormattedMessage} from 'react-intl';
+import {FormattedMessage} from 'react-intl';
 
 import loadingGif from 'images/load.gif';
 
-const holders = defineMessages({
-    plusOne: {
-        id: 'post_body.plusOne',
-        defaultMessage: ' plus 1 other file'
-    },
-    plusMore: {
-        id: 'post_body.plusMore',
-        defaultMessage: ' plus {count} other files'
-    }
-});
-
 import React from 'react';
 
-class PostBody extends React.Component {
+export default class PostBody extends React.Component {
     constructor(props) {
         super(props);
 
@@ -61,8 +50,27 @@ class PostBody extends React.Component {
         this.parseEmojis();
     }
 
+    shouldComponentUpdate(nextProps) {
+        if (!Utils.areObjectsEqual(nextProps.post, this.props.post)) {
+            return true;
+        }
+
+        if (!Utils.areObjectsEqual(nextProps.parentPost, this.props.parentPost)) {
+            return true;
+        }
+
+        if (nextProps.retryPost.toString() !== this.props.retryPost.toString()) {
+            return true;
+        }
+
+        if (nextProps.handleCommentClick.toString() !== this.props.handleCommentClick.toString()) {
+            return true;
+        }
+
+        return false;
+    }
+
     render() {
-        const {formatMessage} = this.props.intl;
         const post = this.props.post;
         const filenames = this.props.post.filenames;
         const parentPost = this.props.parentPost;
@@ -106,9 +114,9 @@ class PostBody extends React.Component {
                 message = parentPost.filenames[0].split('/').pop();
 
                 if (parentPost.filenames.length === 2) {
-                    message += formatMessage(holders.plusOne);
+                    message += Utils.localizeMessage('post_body.plusOne', ' plus 1 other file');
                 } else if (parentPost.filenames.length > 2) {
-                    message += formatMessage(holders.plusMore, {count: (parentPost.filenames.length - 1)});
+                    message += Utils.localizeMessage('post_body.plusMore', ' plus {count} other files').replace('{count}', (parentPost.filenames.length - 1).toString());
                 }
             }
 
@@ -119,8 +127,8 @@ class PostBody extends React.Component {
                             id='post_body.commentedOn'
                             defaultMessage='Commented on {name}{apostrophe} message: '
                             values={{
-                                name: (name),
-                                apostrophe: apostrophe
+                                name,
+                                apostrophe
                             }}
                         />
                         <a
@@ -213,11 +221,8 @@ class PostBody extends React.Component {
 }
 
 PostBody.propTypes = {
-    intl: intlShape.isRequired,
     post: React.PropTypes.object.isRequired,
     parentPost: React.PropTypes.object,
     retryPost: React.PropTypes.func.isRequired,
     handleCommentClick: React.PropTypes.func.isRequired
 };
-
-export default injectIntl(PostBody);
diff --git a/webapp/components/post_focus_view.jsx b/webapp/components/post_focus_view.jsx
index f3dfb46c6..d2fbb4532 100644
--- a/webapp/components/post_focus_view.jsx
+++ b/webapp/components/post_focus_view.jsx
@@ -5,7 +5,6 @@ import PostsView from './posts_view.jsx';
 
 import PostStore from 'stores/post_store.jsx';
 import ChannelStore from 'stores/channel_store.jsx';
-import UserStore from 'stores/user_store.jsx';
 import * as GlobalActions from 'action_creators/global_actions.jsx';
 
 import {FormattedMessage} from 'react-intl';
@@ -18,7 +17,6 @@ export default class PostFocusView extends React.Component {
 
         this.onChannelChange = this.onChannelChange.bind(this);
         this.onPostsChange = this.onPostsChange.bind(this);
-        this.onUserChange = this.onUserChange.bind(this);
         this.handlePostsViewScroll = this.handlePostsViewScroll.bind(this);
         this.loadMorePostsTop = this.loadMorePostsTop.bind(this);
         this.loadMorePostsBottom = this.loadMorePostsBottom.bind(this);
@@ -31,21 +29,18 @@ export default class PostFocusView extends React.Component {
             scrollPostId: focusedPostId,
             postList: PostStore.getVisiblePosts(focusedPostId),
             atTop: PostStore.getVisibilityAtTop(focusedPostId),
-            atBottom: PostStore.getVisibilityAtBottom(focusedPostId),
-            currentUser: UserStore.getCurrentUser()
+            atBottom: PostStore.getVisibilityAtBottom(focusedPostId)
         };
     }
 
     componentDidMount() {
         ChannelStore.addChangeListener(this.onChannelChange);
         PostStore.addChangeListener(this.onPostsChange);
-        UserStore.addChangeListener(this.onUserChange);
     }
 
     componentWillUnmount() {
         ChannelStore.removeChangeListener(this.onChannelChange);
         PostStore.removeChangeListener(this.onPostsChange);
-        UserStore.removeChangeListener(this.onUserChange);
     }
 
     onChannelChange() {
@@ -58,10 +53,6 @@ export default class PostFocusView extends React.Component {
         }
     }
 
-    onUserChange() {
-        this.setState({currentUser: UserStore.getCurrentUser()});
-    }
-
     onPostsChange() {
         const focusedPostId = PostStore.getFocusedPostId();
         if (focusedPostId == null) {
@@ -105,7 +96,7 @@ export default class PostFocusView extends React.Component {
         const postsToHighlight = {};
         postsToHighlight[this.state.scrollPostId] = true;
 
-        if (!this.state.currentUser || !this.state.postList) {
+        if (!this.state.postList) {
             return null;
         }
 
@@ -125,16 +116,8 @@ export default class PostFocusView extends React.Component {
                     introText={this.getIntroMessage()}
                     messageSeparatorTime={0}
                     postsToHighlight={postsToHighlight}
-                    profiles={this.props.profiles}
-                    currentUser={this.state.currentUser}
                 />
             </div>
         );
     }
 }
-PostFocusView.defaultProps = {
-};
-
-PostFocusView.propTypes = {
-    profiles: React.PropTypes.object
-};
diff --git a/webapp/components/posts_view.jsx b/webapp/components/posts_view.jsx
index be098086f..327756723 100644
--- a/webapp/components/posts_view.jsx
+++ b/webapp/components/posts_view.jsx
@@ -2,19 +2,25 @@
 // See License.txt for license information.
 
 import $ from 'jquery';
-import ReactDOM from 'react-dom';
-import PreferenceStore from 'stores/preference_store.jsx';
+
+import Post from './post.jsx';
+import FloatingTimestamp from './floating_timestamp.jsx';
+
 import * as GlobalActions from 'action_creators/global_actions.jsx';
+
+import PreferenceStore from 'stores/preference_store.jsx';
+import UserStore from 'stores/user_store.jsx';
+
 import * as Utils from 'utils/utils.jsx';
-import Post from './post.jsx';
-import Constants from 'utils/constants.jsx';
 import DelayedAction from 'utils/delayed_action.jsx';
 
-import {FormattedDate, FormattedMessage} from 'react-intl';
-
+import Constants from 'utils/constants.jsx';
 const Preferences = Constants.Preferences;
 
+import {FormattedDate, FormattedMessage} from 'react-intl';
+
 import React from 'react';
+import ReactDOM from 'react-dom';
 
 export default class PostsView extends React.Component {
     constructor(props) {
@@ -31,6 +37,7 @@ export default class PostsView extends React.Component {
         this.handleResize = this.handleResize.bind(this);
         this.scrollToBottom = this.scrollToBottom.bind(this);
         this.scrollToBottomAnimated = this.scrollToBottomAnimated.bind(this);
+        this.onUserChange = this.onUserChange.bind(this);
 
         this.jumpToPostNode = null;
         this.wasAtBottom = true;
@@ -43,7 +50,9 @@ export default class PostsView extends React.Component {
             centerPosts: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, Preferences.CHANNEL_DISPLAY_MODE, Preferences.CHANNEL_DISPLAY_MODE_DEFAULT) === Preferences.CHANNEL_DISPLAY_MODE_CENTERED,
             isScrolling: false,
             topPostId: null,
-            showUnreadMessageAlert: false
+            showUnreadMessageAlert: false,
+            currentUser: UserStore.getCurrentUser(),
+            profiles: UserStore.getProfiles()
         };
     }
     static get SCROLL_TYPE_FREE() {
@@ -67,6 +76,9 @@ export default class PostsView extends React.Component {
             centerPosts: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, Preferences.CHANNEL_DISPLAY_MODE, Preferences.CHANNEL_DISPLAY_MODE_DEFAULT) === Preferences.CHANNEL_DISPLAY_MODE_CENTERED
         });
     }
+    onUserChange() {
+        this.setState({currentUser: UserStore.getCurrentUser(), profiles: UserStore.getProfiles()});
+    }
     isAtBottom() {
         // consider the view to be at the bottom if it's within this many pixels of the bottom
         const atBottomMargin = 10;
@@ -152,8 +164,8 @@ export default class PostsView extends React.Component {
     createPosts(posts, order) {
         const postCtls = [];
         let previousPostDay = new Date(0);
-        const userId = this.props.currentUser.id;
-        const profiles = this.props.profiles || {};
+        const userId = this.state.currentUser.id;
+        const profiles = this.state.profiles || {};
 
         let renderedLastViewed = false;
 
@@ -229,8 +241,8 @@ export default class PostsView extends React.Component {
             const shouldHighlight = this.props.postsToHighlight && this.props.postsToHighlight.hasOwnProperty(post.id);
 
             let profile;
-            if (this.props.currentUser.id === post.user_id) {
-                profile = this.props.currentUser;
+            if (userId === post.user_id) {
+                profile = this.state.currentUser;
             } else {
                 profile = profiles[post.user_id];
             }
@@ -250,7 +262,7 @@ export default class PostsView extends React.Component {
                     onClick={() => GlobalActions.emitPostFocusEvent(post.id)} //eslint-disable-line no-loop-func
                     displayNameType={this.state.displayNameType}
                     user={profile}
-                    currentUser={this.props.currentUser}
+                    currentUser={this.state.currentUser}
                     center={this.state.centerPosts}
                 />
             );
@@ -377,13 +389,19 @@ export default class PostsView extends React.Component {
         if (this.props.postList != null) {
             this.updateScrolling();
         }
+
+        if (this.props.isActive) {
+            PreferenceStore.addChangeListener(this.updateState);
+            UserStore.addChangeListener(this.onUserChange);
+        }
+
         window.addEventListener('resize', this.handleResize);
-        PreferenceStore.addChangeListener(this.updateState);
     }
     componentWillUnmount() {
         window.removeEventListener('resize', this.handleResize);
         this.scrollStopAction.cancel();
         PreferenceStore.removeChangeListener(this.updateState);
+        UserStore.removeChangeListener(this.onUserChange);
     }
     componentDidUpdate() {
         if (this.props.postList != null) {
@@ -401,8 +419,10 @@ export default class PostsView extends React.Component {
         if (!this.props.isActive && nextProps.isActive) {
             this.updateState();
             PreferenceStore.addChangeListener(this.updateState);
+            UserStore.addChangeListener(this.onUserChange);
         } else if (this.props.isActive && !nextProps.isActive) {
             PreferenceStore.removeChangeListener(this.updateState);
+            UserStore.removeChangeListener(this.onUserChange);
         }
     }
     shouldComponentUpdate(nextProps, nextState) {
@@ -436,7 +456,7 @@ export default class PostsView extends React.Component {
         if (this.state.centerPosts !== nextState.centerPosts) {
             return true;
         }
-        if (!Utils.areObjectsEqual(this.props.profiles, nextProps.profiles)) {
+        if (!Utils.areObjectsEqual(this.state.profiles, nextState.profiles)) {
             return true;
         }
 
@@ -497,16 +517,17 @@ export default class PostsView extends React.Component {
             }
         }
 
-        let topPost = null;
+        let topPostCreateAt = 0;
         if (this.state.topPostId) {
-            topPost = this.props.postList.posts[this.state.topPostId];
+            topPostCreateAt = this.props.postList.posts[this.state.topPostId].create_at;
         }
 
         return (
             <div className={activeClass}>
                 <FloatingTimestamp
                     isScrolling={this.state.isScrolling}
-                    post={topPost}
+                    isMobile={$(window).width() > 768}
+                    createAt={topPostCreateAt}
                 />
                 <ScrollToBottomArrows
                     isScrolling={this.state.isScrolling}
@@ -551,7 +572,6 @@ PostsView.defaultProps = {
 PostsView.propTypes = {
     isActive: React.PropTypes.bool,
     postList: React.PropTypes.object,
-    profiles: React.PropTypes.object.isRequired,
     scrollPostId: React.PropTypes.string,
     scrollType: React.PropTypes.number,
     postViewScrolled: React.PropTypes.func.isRequired,
@@ -561,47 +581,7 @@ PostsView.propTypes = {
     showMoreMessagesBottom: React.PropTypes.bool,
     introText: React.PropTypes.element,
     messageSeparatorTime: React.PropTypes.number,
-    postsToHighlight: React.PropTypes.object,
-    currentUser: React.PropTypes.object.isRequired
-};
-
-function FloatingTimestamp({isScrolling, post}) {
-    // only show on mobile
-    if ($(window).width() > 768) {
-        return <noscript/>;
-    }
-
-    if (!post) {
-        return <noscript/>;
-    }
-
-    const dateString = (
-        <FormattedDate
-            value={post.create_at}
-            weekday='short'
-            day='2-digit'
-            month='short'
-            year='numeric'
-        />
-    );
-
-    let className = 'post-list__timestamp';
-    if (isScrolling) {
-        className += ' scrolling';
-    }
-
-    return (
-        <div className={className}>
-            <div>
-                <span>{dateString}</span>
-            </div>
-        </div>
-    );
-}
-
-FloatingTimestamp.propTypes = {
-    isScrolling: React.PropTypes.bool.isRequired,
-    post: React.PropTypes.object
+    postsToHighlight: React.PropTypes.object
 };
 
 function ScrollToBottomArrows({isScrolling, atBottom, onClick}) {
diff --git a/webapp/components/posts_view_container.jsx b/webapp/components/posts_view_container.jsx
index edfa314f8..32b0aa578 100644
--- a/webapp/components/posts_view_container.jsx
+++ b/webapp/components/posts_view_container.jsx
@@ -1,12 +1,13 @@
 // Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
 // See License.txt for license information.
 
+import $ from 'jquery';
+
 import PostsView from './posts_view.jsx';
 import LoadingScreen from './loading_screen.jsx';
 
 import ChannelStore from 'stores/channel_store.jsx';
 import PostStore from 'stores/post_store.jsx';
-import UserStore from 'stores/user_store.jsx';
 
 import * as GlobalActions from 'action_creators/global_actions.jsx';
 
@@ -25,7 +26,6 @@ export default class PostsViewContainer extends React.Component {
         this.onChannelChange = this.onChannelChange.bind(this);
         this.onChannelLeave = this.onChannelLeave.bind(this);
         this.onPostsChange = this.onPostsChange.bind(this);
-        this.onUserChange = this.onUserChange.bind(this);
         this.handlePostsViewScroll = this.handlePostsViewScroll.bind(this);
         this.loadMorePostsTop = this.loadMorePostsTop.bind(this);
         this.handlePostsViewJumpRequest = this.handlePostsViewJumpRequest.bind(this);
@@ -33,8 +33,7 @@ export default class PostsViewContainer extends React.Component {
         const currentChannelId = ChannelStore.getCurrentId();
         const state = {
             scrollType: PostsView.SCROLL_TYPE_BOTTOM,
-            scrollPost: null,
-            currentUser: UserStore.getCurrentUser()
+            scrollPost: null
         };
         if (currentChannelId) {
             Object.assign(state, {
@@ -60,17 +59,14 @@ export default class PostsViewContainer extends React.Component {
         ChannelStore.addLeaveListener(this.onChannelLeave);
         PostStore.addChangeListener(this.onPostsChange);
         PostStore.addPostsViewJumpListener(this.handlePostsViewJumpRequest);
-        UserStore.addChangeListener(this.onUserChange);
+        $('body').addClass('app__body');
     }
     componentWillUnmount() {
         ChannelStore.removeChangeListener(this.onChannelChange);
         ChannelStore.removeLeaveListener(this.onChannelLeave);
         PostStore.removeChangeListener(this.onPostsChange);
         PostStore.removePostsViewJumpListener(this.handlePostsViewJumpRequest);
-        UserStore.removeChangeListener(this.onUserChange);
-    }
-    onUserChange() {
-        this.setState({currentUser: UserStore.getCurrentUser()});
+        $('body').removeClass('app__body');
     }
     handlePostsViewJumpRequest(type, post) {
         switch (type) {
@@ -171,7 +167,7 @@ export default class PostsViewContainer extends React.Component {
         const currentChannelId = channels[this.state.currentChannelIndex];
         const channel = ChannelStore.get(currentChannelId);
 
-        if (!this.state.currentUser || !channel) {
+        if (!channel) {
             return null;
         }
 
@@ -194,8 +190,6 @@ export default class PostsViewContainer extends React.Component {
                     showMoreMessagesBottom={false}
                     introText={channel ? createChannelIntroMessage(channel) : null}
                     messageSeparatorTime={this.state.currentLastViewed}
-                    profiles={this.props.profiles}
-                    currentUser={this.state.currentUser}
                 />
             );
             if (!postLists[i] && isActive) {
@@ -215,7 +209,3 @@ export default class PostsViewContainer extends React.Component {
         );
     }
 }
-
-PostsViewContainer.propTypes = {
-    profiles: React.PropTypes.object
-};
diff --git a/webapp/components/rhs_comment.jsx b/webapp/components/rhs_comment.jsx
index 709865dc1..290eb64c6 100644
--- a/webapp/components/rhs_comment.jsx
+++ b/webapp/components/rhs_comment.jsx
@@ -1,35 +1,32 @@
 // Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
 // See License.txt for license information.
 
-import ReactDOM from 'react-dom';
+import UserProfile from './user_profile.jsx';
+import FileAttachmentList from './file_attachment_list.jsx';
+
 import PostStore from 'stores/post_store.jsx';
 import ChannelStore from 'stores/channel_store.jsx';
-import UserProfile from './user_profile.jsx';
+
+import * as GlobalActions from 'action_creators/global_actions.jsx';
 import AppDispatcher from '../dispatcher/app_dispatcher.jsx';
+
+import * as TextFormatting from 'utils/text_formatting.jsx';
 import * as Utils from 'utils/utils.jsx';
-import Constants from 'utils/constants.jsx';
-import FileAttachmentList from './file_attachment_list.jsx';
 import Client from 'utils/web_client.jsx';
 import * as AsyncClient from 'utils/async_client.jsx';
-var ActionTypes = Constants.ActionTypes;
-import * as TextFormatting from 'utils/text_formatting.jsx';
-import twemoji from 'twemoji';
-import * as GlobalActions from 'action_creators/global_actions.jsx';
 
-import {intlShape, injectIntl, defineMessages, FormattedMessage, FormattedDate} from 'react-intl';
+import Constants from 'utils/constants.jsx';
+const ActionTypes = Constants.ActionTypes;
 
-import loadingGif from 'images/load.gif';
+import {FormattedMessage, FormattedDate} from 'react-intl';
 
-const holders = defineMessages({
-    comment: {
-        id: 'rhs_comment.comment',
-        defaultMessage: 'Comment'
-    }
-});
+import loadingGif from 'images/load.gif';
 
 import React from 'react';
+import ReactDOM from 'react-dom';
+import twemoji from 'twemoji';
 
-class RhsComment extends React.Component {
+export default class RhsComment extends React.Component {
     constructor(props) {
         super(props);
 
@@ -136,7 +133,7 @@ class RhsComment extends React.Component {
                         data-toggle='modal'
                         data-target='#edit_post'
                         data-refocusid='#reply_textbox'
-                        data-title={this.props.intl.formatMessage(holders.comment)}
+                        data-title={Utils.localizeMessage('rhs_comment.comment', 'Comment')}
                         data-message={post.message}
                         data-postid={post.id}
                         data-channelid={post.channel_id}
@@ -302,14 +299,8 @@ class RhsComment extends React.Component {
     }
 }
 
-RhsComment.defaultProps = {
-    post: null
-};
 RhsComment.propTypes = {
-    intl: intlShape.isRequired,
     post: React.PropTypes.object,
     user: React.PropTypes.object.isRequired,
     currentUser: React.PropTypes.object.isRequired
 };
-
-export default injectIntl(RhsComment);
diff --git a/webapp/components/sidebar.jsx b/webapp/components/sidebar.jsx
index 2ccf01740..1f73e743f 100644
--- a/webapp/components/sidebar.jsx
+++ b/webapp/components/sidebar.jsx
@@ -698,8 +698,3 @@ export default class Sidebar extends React.Component {
         );
     }
 }
-
-Sidebar.defaultProps = {
-};
-Sidebar.propTypes = {
-};
diff --git a/webapp/components/sidebar_right_menu.jsx b/webapp/components/sidebar_right_menu.jsx
index 42bc7ce53..b368f9fe1 100644
--- a/webapp/components/sidebar_right_menu.jsx
+++ b/webapp/components/sidebar_right_menu.jsx
@@ -20,6 +20,7 @@ import {Link} from 'react-router';
 import {createMenuTip} from 'components/tutorial/tutorial_tip.jsx';
 
 import React from 'react';
+import PureRenderMixin from 'react-addons-pure-render-mixin';
 
 export default class SidebarRightMenu extends React.Component {
     constructor(props) {
@@ -30,6 +31,8 @@ export default class SidebarRightMenu extends React.Component {
         const state = this.getStateFromStores();
         state.showUserSettingsModal = false;
 
+        this.shouldComponentUpdate = PureRenderMixin.shouldComponentUpdate.bind(this);
+
         this.state = state;
     }
 
diff --git a/webapp/components/time_since.jsx b/webapp/components/time_since.jsx
index 02b0174ae..9f7a93ceb 100644
--- a/webapp/components/time_since.jsx
+++ b/webapp/components/time_since.jsx
@@ -9,8 +9,14 @@ import {FormattedRelative, FormattedDate} from 'react-intl';
 import {Tooltip, OverlayTrigger} from 'react-bootstrap';
 
 import React from 'react';
+import PureRenderMixin from 'react-addons-pure-render-mixin';
 
 export default class TimeSince extends React.Component {
+    constructor(props) {
+        super(props);
+
+        this.shouldComponentUpdate = PureRenderMixin.shouldComponentUpdate.bind(this);
+    }
     componentDidMount() {
         this.intervalId = setInterval(() => {
             this.forceUpdate();
diff --git a/webapp/components/user_profile.jsx b/webapp/components/user_profile.jsx
index 04b4f99a4..673422d3f 100644
--- a/webapp/components/user_profile.jsx
+++ b/webapp/components/user_profile.jsx
@@ -22,6 +22,25 @@ export default class UserProfile extends React.Component {
         super(props);
         this.uniqueId = nextId();
     }
+    shouldComponentUpdate(nextProps) {
+        if (!Utils.areObjectsEqual(nextProps.user, this.props.user)) {
+            return true;
+        }
+
+        if (nextProps.overwriteName !== this.props.overwriteName) {
+            return true;
+        }
+
+        if (nextProps.overwriteImage !== this.props.overwriteImage) {
+            return true;
+        }
+
+        if (nextProps.disablePopover !== this.props.disablePopover) {
+            return true;
+        }
+
+        return false;
+    }
     render() {
         let name = '...';
         let email = '';