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== Introduction ==
The '''Async Pan/Zoom module (APZ)'''<sup>1</sup> is a platform component that allows panning and zooming to be performed asynchronously (on the compositor thread rather than the main theadthread).
For '''zooming''', this means that the APZ reacts to a pinch gesture immediately and instructs the compositor to scale the already-rendered layers at whatever resolution they have been rendered (so e.g. text becomes more blurry as you zoom in), and meanwhile sends a request to Gecko to re-render the content at a new resolution (with sharp text and all).
