Ext.decode vs JSON.parse

jsonParser.js

// 48 instances of Ext.decode
// 23 instances of Ext.encode
// collection size 7

(function() {
	console.time('test')
	var x = Ext.decode(temp1.responseText);
	console.timeEnd('test')
	console.log(x)
})()//test: 0.597ms 

	// vs
	
(function() {
	console.time('test')
	var x = JSON.parse(temp1.responseText);
	console.timeEnd('test')
	console.log(x)
})() //test: 0.113ms