From 8db142554fbe1c85aa8ffcdf0900b2855645939b Mon Sep 17 00:00:00 2001
From: Cheng-Han, Wu
Date: Thu, 11 Feb 2016 14:35:25 -0600
Subject: Updated rendering operations to improve performance

---
 public/js/index.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'public/js/index.js')

diff --git a/public/js/index.js b/public/js/index.js
index 2e797ac3..3507e016 100644
--- a/public/js/index.js
+++ b/public/js/index.js
@@ -2132,10 +2132,15 @@ var lastResult = null;
 function updateViewInner() {
     if (currentMode == modeType.edit || !isDirty) return;
     var value = editor.getValue();
+    var lastMeta = md.meta;
     md.meta = {};
-    md.render(value); //only for get meta
-    parseMeta(md, ui.area.markdown, $('#toc'), $('#toc-affix'));
     var rendered = md.render(value);
+    // only render again when meta changed
+    if (JSON.stringify(md.meta) != JSON.stringify(lastMeta)) {
+        parseMeta(md, ui.area.markdown, $('#toc'), $('#toc-affix'));
+        rendered = md.render(value);
+    }
+    // prevent XSS
     rendered = preventXSS(rendered);
     var result = postProcess(rendered).children().toArray();
     partialUpdate(result, lastResult, ui.area.markdown.children().toArray());
-- 
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