From 9d180de631c24c2e4a8a9115c0ead75a57cd8504 Mon Sep 17 00:00:00 2001
From: Ludwig Schubert <ludwigschubert@google.com>
Date: Thu, 24 Aug 2017 10:30:36 -0700
Subject: [PATCH] Minor perf tweaks

---
 src/components/d-figure.js       | 14 ++++++++------
 src/components/d-front-matter.js | 12 ++++++++----
 2 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/src/components/d-figure.js b/src/components/d-figure.js
index aa4e2d1..571612a 100644
--- a/src/components/d-figure.js
+++ b/src/components/d-figure.js
@@ -87,12 +87,14 @@ export class Figure extends HTMLElement {
   addEventListener(eventName, callback) {
     super.addEventListener(eventName, callback);
     // if we had already dispatched something while presumingly no one was listening, we do so again
-    if (this._ready && eventName === 'ready') {
-      this.ready();
-    }
-    if (this._onscreen && eventName === 'onscreen') {
-      this.onscreen();
-    }
+    setTimeout(() => {
+      if (this._ready && eventName === 'ready') {
+        this.ready();
+      }
+      if (this._onscreen && eventName === 'onscreen') {
+        this.onscreen();
+      }
+    }, 1);
   }
 
   // Custom Events
diff --git a/src/components/d-front-matter.js b/src/components/d-front-matter.js
index 13ce892..b47b0b2 100644
--- a/src/components/d-front-matter.js
+++ b/src/components/d-front-matter.js
@@ -19,10 +19,14 @@ export class FrontMatter extends HTMLElement {
   constructor() {
     super();
 
-    const options = {childList: true, characterData: true, subtree: true};
-    const observer = new MutationObserver( () => {
-      const data = parseFrontmatter(this);
-      this.notify(data);
+    const options = {childList: true};
+    const observer = new MutationObserver( (entries) => {
+      for (const entry of entries) {
+        if (entry.target.nodeName === 'SCRIPT') {
+          const data = parseFrontmatter(this);
+          this.notify(data);
+        }
+      }
     });
     observer.observe(this, options);
   }