diff --git a/src/Miscellaneous/RelativeDates.coffee b/src/Miscellaneous/RelativeDates.coffee
index 982d88d32..42b0cfa61 100644
--- a/src/Miscellaneous/RelativeDates.coffee
+++ b/src/Miscellaneous/RelativeDates.coffee
@@ -7,7 +7,7 @@ RelativeDates =
       Index.enabled
     )
       @flush()
-      $.on d, 'visibilitychange ThreadUpdate', @flush
+      $.on d, 'visibilitychange PostsInserted', @flush
 
     if Conf['Relative Post Dates']
       Callbacks.Post.push
diff --git a/src/Monitoring/Unread.coffee b/src/Monitoring/Unread.coffee
index 82125b197..4714deff8 100644
--- a/src/Monitoring/Unread.coffee
+++ b/src/Monitoring/Unread.coffee
@@ -60,7 +60,7 @@ Unread =
     Unread.readCount = 0
     Unread.readCount++ for ID in @posts.keys when +ID <= Unread.lastReadPost
     $.one d, '4chanXInitFinished', Unread.ready
-    $.on  d, 'ThreadUpdate',       Unread.onUpdate
+    $.on  d, 'PostsInserted',      Unread.onUpdate
 
   ready: ->
     Unread.scroll() if Conf['Remember Last Read Post'] and Conf['Scroll to Last Read Post']
@@ -137,11 +137,11 @@ Unread =
         notif.close()
       , 7 * $.SECOND
 
-  onUpdate: (e) ->
-    if !e.detail[404]
+  onUpdate: ->
+    $.queueTask -> # ThreadUpdater may scroll immediately after inserting posts
       Unread.setLine()
       Unread.read()
-    Unread.update()
+      Unread.update()
 
   readSinglePost: (post) ->
     {ID} = post
diff --git a/src/main/Main.coffee b/src/main/Main.coffee
index 47eda1404..8ee5f176c 100644
--- a/src/main/Main.coffee
+++ b/src/main/Main.coffee
@@ -326,6 +326,9 @@ Main =
     if (board = $ s.board)
       threads = []
       posts   = []
+      errors  = []
+
+      Main.addPostsObserver = new MutationObserver Main.addPosts
 
       for threadRoot in $$(s.thread, board)
         boardObj = if (boardID = threadRoot.dataset.board)
@@ -338,17 +341,9 @@ Main =
         threads.push thread
         postRoots = $$ s.postContainer, threadRoot
         postRoots.unshift threadRoot if Site.isOPContainerThread
-        for postRoot in postRoots when $(s.comment, postRoot)
-          try
-            posts.push new Post postRoot, thread, thread.board
-          catch err
-            # Skip posts that we failed to parse.
-            unless errors
-              errors = []
-            errors.push
-              message: "Parsing of Post No.#{postRoot.id.match(/\d+/)} failed. Post will be skipped."
-              error: err
-      Main.handleErrors errors if errors
+        Main.parsePosts postRoots, thread, posts, errors
+        Main.addPostsObserver.observe threadRoot, {childList: true}
+      Main.handleErrors errors if errors.length
 
       if g.VIEW is 'thread'
         Site.parseThreadMetadata?(threads[0])
@@ -363,6 +358,33 @@ Main =
       Main.expectInitFinished = true
       $.event '4chanXInitFinished'
 
+  parsePosts: (postRoots, thread, posts, errors) ->
+    for postRoot in postRoots when !postRoot.dataset.fullID and $(Site.selectors.comment, postRoot)
+      try
+        posts.push new Post postRoot, thread, thread.board
+      catch err
+        # Skip posts that we failed to parse.
+        errors.push
+          message: "Parsing of Post No.#{postRoot.id.match(/\d+/)} failed. Post will be skipped."
+          error: err
+    return
+
+  addPosts: (records) ->
+    threads = []
+    posts   = []
+    errors  = []
+    for record in records
+      thread = Get.threadFromRoot record.target
+      n = posts.length
+      Main.parsePosts record.addedNodes, thread, posts, errors
+      if posts.length > n and thread not in threads
+        threads.push thread
+    Main.handleErrors errors if errors.length
+    Main.callbackNodesDB 'Post', posts, ->
+      for thread in threads
+        $.event 'PostsInserted', null, thread.nodes.root
+      return
+
   callbackNodes: (klass, nodes) ->
     i = 0
     cb = Callbacks[klass]