Problem is that the Lockscreen height is defined like this:

    Lockscreen {
        y: panel.panelHeight
        width: parent.width
        height: parent.height - panel.panelHeight
    }

and Lockscreen contains:

    Image {
        // Limit how much memory we'll reserve for this image
        sourceSize.height: height
        sourceSize.width: width
        fillMode: Image.PreserveAspectCrop
    }

panel.panelHeight is a property which is animated during unlock, if the
application is fullscreen. Animating sourceSize is a bad thing, as it
causes the CPU to rescaling the image each time.

** Changed in: unity8 (Ubuntu)
       Status: Triaged => In Progress

** Changed in: unity8 (Ubuntu)
     Assignee: (unassigned) => Gerry Boland (gerboland)

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https://bugs.launchpad.net/bugs/1396244

Title:
  Unlocking the phone over fullscreen app is very slow

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