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docs: add tip about combining defer() with React 19's Activity component #44

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uhyo merged 1 commit into from
Feb 1, 2026
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docs: add tip about combining defer() with React 19's Activity component #44

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2 changes: 2 additions & 0 deletions packages/docs/src/pages/learn/OptimizingPayloads.mdx
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Expand Up @@ -98,6 +98,8 @@ Each payload file has a **content-based hash** in its filename. This enables agg

**Consider below-the-fold content** - Content hidden in collapsed sections, tabs, or modals is a good candidate for `defer()` since users may never need it.

> **Tip:** You can combine `defer()` with React 19's `<Activity>` component to prefetch content in the background. When a `defer()`ed node is rendered under `<Activity mode="hidden">`, it won't be shown in the UI, but the fetch of the RSC payload will start immediately. This is useful when hidden content (like inactive tabs or collapsed sections) should be fetched ahead of time so it's ready when the user needs it.

## See Also

- [defer()](/funstack-static/api/defer) - API reference with full signature and technical details
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