Index optimization: only build/load last replies of visible threads.

src/Filtering/ThreadHiding.coffee

@@ -16,8 +16,12 @@ ThreadHiding =
     $.prepend @OP.nodes.root, ThreadHiding.makeButton @, 'hide'
 
   onrefresh: ->
-    for threadID, thread of g.BOARD.threads when thread.isHidden and thread.stub
-      $.prepend thread.OP.nodes.root.parentNode, thread.stub
+    for threadID, thread of g.BOARD.threads when thread.isHidden
+      root = thread.OP.nodes.root.parentNode
+      if thread.stub
+        $.prepend root, thread.stub
+      else
+        threadRoot.nextElementSibling.hidden = true
     return
 
   syncCatalog: ->

src/General/Build.coffee

@@ -271,26 +271,16 @@ Build =
   thread: (board, data) ->
     Build.spoilerRange[board] = data.custom_spoiler
 
-    if (OP = board.posts[data.no]) and parent = OP.nodes.root.parentNode
-      root = parent
-      hr   = parent.nextElementSibling
+    if (OP = board.posts[data.no]) and root = OP.nodes.root.parentNode
       $.rmAll root
     else
       root = $.el 'div',
         className: 'thread'
         id: "t#{data.no}"
-      hr   = $.el 'hr'
 
-    nodes = []
-    for obj in [data].concat data.last_replies or []
-      nodes.push if post = board.posts[obj.no]
-        post.nodes.root
-      else
-        Build.postFromObject obj, board.ID
-
-    # build if necessary
+    nodes = [if OP then OP.nodes.root else Build.postFromObject data, board.ID]
     if data.omitted_posts
-      nodes.splice 1, 0, Build.summary board.ID, data.no, data.omitted_posts, data.omitted_images
+      nodes.push Build.summary board.ID, data.no, data.omitted_posts, data.omitted_images
 
     $.add root, nodes
-    [root, hr]
+    root

src/General/Index.coffee

@@ -158,6 +158,7 @@ Index =
     try
       Index.parse JSON.parse req.response if req.status is 200
     catch err
+      c.error 'Index failure:', err.stack
       # network error or non-JSON content for example.
       notice.setType 'error'
       notice.el.lastElementChild.textContent = 'Index refresh failed.'
@@ -171,7 +172,7 @@ Index =
     Index.scrollToIndex()
   parse: (pages) ->
     Index.parseThreadList pages
-    Index.buildAll()
+    Index.buildThreads()
     Index.sort()
     Index.buildIndex()
     Index.buildPagelist()
@@ -183,35 +184,59 @@ Index =
     for threadID, thread of g.BOARD.threads when thread.ID not in Index.liveThreadIDs
       thread.collect()
     return
-  buildAll: ->
+  buildThreads: ->
     Index.nodes = []
     threads     = []
     posts       = []
     for threadData in Index.liveThreadData
-      [threadRoot, hr] = Build.thread g.BOARD, threadData
-      Index.nodes.push threadRoot, hr
+      threadRoot = Build.thread g.BOARD, threadData
+      Index.nodes.push threadRoot, $.el 'hr'
       if thread = g.BOARD.threads[threadData.no]
         thread.setStatus 'Sticky', !!threadData.sticky
         thread.setStatus 'Closed', !!threadData.closed
       else
         thread = new Thread threadData.no, g.BOARD
         threads.push thread
-      postRoots = $$ '.thread > .postContainer', threadRoot
-      for postRoot in postRoots when postRoot.id.match(/\d+/)[0] not of thread.posts
+      # postRoots = $$ '.thread > .postContainer', threadRoot
+      # for postRoot in postRoots when postRoot.id.match(/\d+/)[0] not of thread.posts
+      OPRoot = $ '.opContainer', threadRoot
+      continue if OPRoot.id.match(/\d+/)[0] of thread.posts
+      try
+        posts.push new Post OPRoot, thread, g.BOARD
+      catch err
+        # Skip posts that we failed to parse.
+        Main.handleErrors
+          message: "Parsing of Post No.#{postRoot.id.match /\d+/} failed. Post will be skipped."
+          error: err
+
+    # Add the threads and <hr>s in a container to make sure all features work.
+    $.nodes Index.nodes
+    Main.callbackNodes Thread, threads
+    Main.callbackNodes Post,   posts
+  buildReplies: (threadRoots) ->
+    posts = []
+    for threadRoot in threadRoots by 2
+      thread = Get.threadFromRoot threadRoot
+      i = Index.liveThreadIDs.indexOf thread.ID
+      continue unless lastReplies = Index.liveThreadData[i].last_replies
+      nodes = []
+      for data in lastReplies
+        if post = thread.posts[data.no]
+          nodes.push post.nodes.root
+          continue
+        nodes.push node = Build.postFromObject data, thread.board.ID
         try
-          posts.push new Post postRoot, thread, g.BOARD
+          posts.push new Post node, thread, thread.board
         catch err
           # Skip posts that we failed to parse.
           errors = [] unless errors
           errors.push
             message: "Parsing of Post No.#{postRoot.id.match /\d+/} failed. Post will be skipped."
             error: err
-    Main.handleErrors errors if errors
+      $.add threadRoot, nodes
 
-    # Add the threads and <hr>s in a container to make sure all features work.
-    $.nodes Index.nodes
-    Main.callbackNodes Thread, threads
-    Main.callbackNodes Post,   posts
+    Main.handleErrors errors if errors
+    Main.callbackNodes Post, posts
   sort: ->
     switch Conf['Index Sort']
       when 'bump'
@@ -232,7 +257,7 @@ Index =
     for threadID in sortedThreadIDs
       i = Index.liveThreadIDs.indexOf(threadID) * 2
       Index.sortedNodes.push Index.nodes[i], Index.nodes[i + 1]
-    # Put the sticky threads on top of the index.g
+    # Put the sticky threads on top of the index.
     offset = 0
     for threadRoot, i in Index.sortedNodes by 2 when Get.threadFromRoot(threadRoot).isSticky
       Index.sortedNodes.splice offset++ * 2, 0, Index.sortedNodes.splice(i, 2)...
@@ -251,5 +276,6 @@ Index =
     else
       nodes = Index.sortedNodes
     $.rmAll Index.root
+    Index.buildReplies nodes
     $.event 'IndexRefresh'
     $.add Index.root, nodes