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wp-content/plugins/wp-optimize/js/loadAsync.js

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+/**
+ * This function will work cross-browser for loading scripts asynchronously
+ */
+function loadAsync(src, callback) {
+	var scriptTag,
+		ready = false;
+
+	scriptTag = document.createElement('script');
+	scriptTag.type = 'text/javascript';
+	scriptTag.src = src;
+	scriptTag.onreadystatechange = function() {
+		// console.log( this.readyState ); //uncomment this line to see which ready states are called.
+		if (!ready
+			&& (!this.readyState || this.readyState == 'complete')
+		) {
+			ready = true;
+			typeof callback === 'function' && callback();
+		}
+	};
+	scriptTag.onload = scriptTag.onreadystatechange
+	
+	document.getElementsByTagName("head")[0].appendChild(scriptTag)
+}