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Editorial Team
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Asked: 2026-05-15T14:53:14+00:00

As title says, I’m wondering if stacking subviews can slow down an iPhone application.

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As title says, I’m wondering if stacking subviews can slow down an iPhone application.

For example, I have a UIViewController, which has a view occupying the whole screen. When the user presses a button, I create a second view controller and add its view as a subview of the original VC, making the second view completely hide the first one.

Does the application have some kind of automatic optimization which would be something like “ok, I know what to draw for every pixel of the screen, I stop seeking for subviews” ?

If not, I don’t think stacking 2 full-screen views can really slow down the app, but could 3, 4 or more views be problematic if they include many subviews themselves (labels, images)?

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1 Answer

  1. Editorial Team

    Read the View Controller Guide sections on Modal View Controllers and memory management. Prefer to use modal Views instead of subviews when you want to present a new screen temporarily and a UINavigationController for “drill-down” views.

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