From fd2723ff7d3605ff2f74f5d0db4ef1e2be2c67c4 Mon Sep 17 00:00:00 2001
From: Paul Kaplan <pkaplan@media.mit.edu>
Date: Mon, 7 Jan 2019 13:02:30 -0500
Subject: [PATCH] Do not deep clone before serializing.

This was ok when we did not attach assets, but it is not cool now. With large assets, this made saving extremely slow
---
 src/serialization/sb3.js | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/serialization/sb3.js b/src/serialization/sb3.js
index 2eace3c3..bcea2c70 100644
--- a/src/serialization/sb3.js
+++ b/src/serialization/sb3.js
@@ -14,7 +14,6 @@ const StageLayering = require('../engine/stage-layering');
 const log = require('../util/log');
 const uid = require('../util/uid');
 const MathUtil = require('../util/math-util');
-const StringUtil = require('../util/string-util');
 
 const {loadCostume} = require('../import/load-costume.js');
 const {loadSound} = require('../import/load-sound.js');
@@ -521,7 +520,7 @@ const serialize = function (runtime, targetId) {
 
     const layerOrdering = getSimplifiedLayerOrdering(originalTargetsToSerialize);
 
-    const flattenedOriginalTargets = JSON.parse(StringUtil.stringify(originalTargetsToSerialize));
+    const flattenedOriginalTargets = originalTargetsToSerialize.map(t => t.toJSON());
 
     // If the renderer is attached, and we're serializing a whole project (not a sprite)
     // add a temporary layerOrder property to each target.