Using AnimatedBuilder helps keep your app smooth by rebuilding only the parts of the UI that need to change during an animation. This means your app can maintain a steady frame rate close to 60fps, which feels smooth to users. It also helps reduce unnecessary work, saving battery and memory.
To keep animations smooth, use AnimatedBuilder to rebuild only the widgets that depend on the animation value. Avoid rebuilding large widget trees inside the builder function. Cache static parts outside the builder. Also, keep your animation logic simple and avoid heavy computations during animation frames.
Using AnimatedBuilder itself does not add noticeable size to your app bundle. It is part of Flutter's core animation library. However, complex animations with many assets or large images can increase bundle size and startup time. Keep assets optimized and load heavy resources lazily if possible.
AnimatedBuilder works the same on both iOS and Android because Flutter uses its own rendering engine. However, on iOS devices with ProMotion displays, animations can run at up to 120fps if optimized well. On Android, frame rates depend on the device hardware but aim for 60fps for smoothness. Both platforms benefit from efficient animation code.
If your screen with AnimatedBuilder takes too long to load, it might be because the animation is triggering heavy widget rebuilds or complex computations on every frame. Check if you are rebuilding large widget trees inside the builder. Also, verify if you are loading large assets synchronously during animation. Optimize by caching static widgets and loading assets asynchronously.