From 637e3abfc9cd93ba518ba070f01bae7ceaa73627 Mon Sep 17 00:00:00 2001
From: Toby Zerner <toby.zerner@gmail.com>
Date: Fri, 31 Jul 2015 20:32:49 +0930
Subject: [PATCH] PERF: Cache emojified post content

---
 extensions/emoji/js/forum/src/main.js | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/extensions/emoji/js/forum/src/main.js b/extensions/emoji/js/forum/src/main.js
index af43e47af..26ce757fc 100644
--- a/extensions/emoji/js/forum/src/main.js
+++ b/extensions/emoji/js/forum/src/main.js
@@ -5,8 +5,15 @@ import app from 'flarum/app';
 import Post from 'flarum/models/Post';
 
 app.initializers.add('emoji', () => {
-  override(Post.prototype, 'contentHtml', original => {
-    return twemoji.parse(original());
+  override(Post.prototype, 'contentHtml', function(original) {
+    const contentHtml = original();
+
+    if (this.oldContentHtml !== contentHtml) {
+      this.emojifiedContentHtml = twemoji.parse(contentHtml);
+      this.oldContentHtml = contentHtml;
+    }
+
+    return this.emojifiedContentHtml;
   });
 
   override(s9e.TextFormatter, 'preview', (original, text, element) => {