Arrays Are Faster Than Objects

If you try and store something in like, spot one thousand, and you only have ten things in the array, does it, doesn't it fill out the array all the way out to one thousand or whatever? No, it would not drigify. And i personally have not seen arrays any faster than objects because i did some naive things a like a year ago where i was like, oh, it's an array, therefore it's faster. But then it turned out i was just wasting my time, right?