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If something is offscreen, we can delay any logic related to it. If data is arriving faster than the frame rate, we can coalesce and batch updates. We can prioritize work coming from user interactions (such as an animation caused by a button click) over less important background work (such as rendering new content just loaded from the network) to avoid dropping frames.

To be clear, we are not taking advantage of this right now. However the freedom to do something like this is why we prefer to have control over scheduling, and why setState() is asynchronous. Conceptually, we think of it as “scheduling an update”.
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如果某些内容在屏幕外，我们可以延迟与其相关的任何逻辑。如果数据到达速度快于帧速率，我们可以合并并批量更新。