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Editorial Team
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Asked: 2026-06-10T02:42:27+00:00

I don’t have any hardcore data supporting this, but generally, you’ll notice that any

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I don’t have any hardcore data supporting this, but generally, you’ll notice that any app you play with or one you’re working on, when the app first loads, doing something such as displaying a modal view controller is slow the first time, but every subsequent time, it’s really fast. For my app, when I present a modal view controller the first time, it takes about 3 seconds, but if I do it over and over again after that, it takes less than a second every time. What is the reason for this?

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1 Answer

  1. Editorial Team

    There’s a bunch of possible explanations here.

    • Something’s been cached. The first time, it had to load something from “disk,” the second time it was already in memory. This could be an entire framework, or NIBs or graphic resources in the OS itself.
    • Memory management. iOS didn’t have enough memory to satisfy the request the first time. iOS spent some time clearing out memory, possibly quitting background applications. The second time, it’s already available.
    • Probably many others.
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