Say I have an app and I notice it has high memory usage. How do I determine WHAT is taking up all the memory in terms of specific object(s). Can I do this through the Xcode Memory Debugger somehow? Instruments?

Take this code example:

```swift
class RootViewController: UIViewController {
    var image: UIImage?

    override func viewDidLoad() {
        super.viewDidLoad()

        let data = try! Data(contentsOf: URL(string: "https://effigis.com/wp-content/uploads/2015/02/Airbus_Pleiades_50cm_8bit_RGB_Yogyakarta.jpg")!)
        self.image = UIImage(data: data)
    }
}

```

The image at that URL is about 40 MB, and in this example contributes significantly to my app's large memory footprint.

How do I determine "Oh yeah, it's this `UIImage` right here taking up 40 MB of memory by itself!"