From e0a8385eb018e7974859fc959d13cad4d69f971c Mon Sep 17 00:00:00 2001
From: Sven Slootweg <admin@cryto.net>
Date: Tue, 22 Aug 2017 09:37:28 +0200
Subject: [PATCH] Only process properties that have actually changed

---
 src/create-object.js | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/src/create-object.js b/src/create-object.js
index 18923c1..ae390e3 100644
--- a/src/create-object.js
+++ b/src/create-object.js
@@ -36,14 +36,23 @@ module.exports = function createObject(options) {
 				transformedProperties = properties;
 			}
 
-			Object.assign(this, transformedProperties);
-
-			if (Object.keys(transformedProperties).some(property => this.sizeBustingProperties.includes(property))) {
-				/* If the size changes, the cache should also be implicitly busted. */
-				this.bustSize();
-				this.bustCache();
-			} else if (Object.keys(transformedProperties).some(property => this.cacheBustingProperties.includes(property))) {
-				this.bustCache();
+			Object.keys(transformedProperties).forEach((property) => {
+				/* Don't apply unchanged properties, to prevent unnecessary cache or size busting. */
+				if (this[property] === transformedProperties[property]) {
+					delete transformedProperties[property];
+				}
+			});
+
+			if (Object.keys(transformedProperties).length > 0) {
+				Object.assign(this, transformedProperties);
+
+				if (Object.keys(transformedProperties).some(property => this.sizeBustingProperties.includes(property))) {
+					/* If the size changes, the cache should also be implicitly busted. */
+					this.bustSize();
+					this.bustCache();
+				} else if (Object.keys(transformedProperties).some(property => this.cacheBustingProperties.includes(property))) {
+					this.bustCache();
+				}
 			}
 		},
 		render: function renderObject(context, options = {}) {