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    <p>As with any performance-related question, the answer will depend on what you're trying to do and the hardware you're trying to do it on. As I report in my answer <a href="https://stackoverflow.com/questions/528098/uiview-based-animation/528848#528848">here</a>, I was able to animate 50 moving translucent CALayers at 60 FPS on the original iPhone hardware using Core Animation. Currently shipping devices, like the iPhone 4, iPad, and particularly iPad 2 are much faster than this first generation of hardware.</p> <p>I'd recommend trying to port Matt's Mac Core Animation Asteroids example over to iOS as an exercise. As you say, you can't tell what the performance will be like until you run it on an actual device, so why not give it a try? Looking at what he does, it shouldn't be that hard to bring that example to iOS because much of the Core Animation code will remain the same.</p> <p>You might have gotten the "Core Animation is just for board games" impression from Jens Alfke's <a href="https://bitbucket.org/snej/geekgameboard/overview" rel="nofollow noreferrer">GeekGameBoard</a> code, which does implement a board game system using Core Animation. Several people have based other applications off of this. That doesn't mean that Core Animation is only useful for that particular genre.</p> <p>Yes, OpenGL ES will give you the ability to extract that last bit of performance out of the hardware, but it will take a lot more code to do so if you don't leverage a framework like cocos2d. Core Animation can be very fast, if you use it properly, and is much easier to work with.</p>
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    1. COThanks for the long, detailed answer, though I have one final question. I know OpenGL ES has the "game loop", which keeps the game running and also evens out the performance on all devices. Is the game loop just something specific for OpenGL, or can it be used with Core Animation?
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    2. CO@Andy B - OpenGL ES is just a display technology, and doesn't have any concept of a game loop. A game loop is implemented by the developer as part of their backend code. On iOS you might use CADisplayLink to handle the regular updates of your screen material and / or perform AI calculations or other operations. You might also have a background thread or GCD queue that manages this. If you're talking about the rate at which visual content is updated onscreen, Core Animation manages that for you, trying to keep things as smooth as possible. In OpenGL ES, it's up to you to manage this.
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