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+---
+title: Parallel Data Fetching with Component Composition
+impact: CRITICAL
+impactDescription: eliminates server-side waterfalls
+tags: server, rsc, parallel-fetching, composition
+---
+
+## Parallel Data Fetching with Component Composition
+
+React Server Components execute sequentially within a tree. Restructure with composition to parallelize data fetching.
+
+**Incorrect (Sidebar waits for Page's fetch to complete):**
+
+```tsx
+export default async function Page() {
+  const header = await fetchHeader();
+  return (
+    <div>
+      <div>{header}</div>
+      <Sidebar />
+    </div>
+  );
+}
+
+async function Sidebar() {
+  const items = await fetchSidebarItems();
+  return <nav>{items.map(renderItem)}</nav>;
+}
+```
+
+**Correct (both fetch simultaneously):**
+
+```tsx
+async function Header() {
+  const data = await fetchHeader();
+  return <div>{data}</div>;
+}
+
+async function Sidebar() {
+  const items = await fetchSidebarItems();
+  return <nav>{items.map(renderItem)}</nav>;
+}
+
+export default function Page() {
+  return (
+    <div>
+      <Header />
+      <Sidebar />
+    </div>
+  );
+}
+```
+
+**Alternative with children prop:**
+
+```tsx
+async function Header() {
+  const data = await fetchHeader();
+  return <div>{data}</div>;
+}
+
+async function Sidebar() {
+  const items = await fetchSidebarItems();
+  return <nav>{items.map(renderItem)}</nav>;
+}
+
+function Layout({ children }: { children: ReactNode }) {
+  return (
+    <div>
+      <Header />
+      {children}
+    </div>
+  );
+}
+
+export default function Page() {
+  return (
+    <Layout>
+      <Sidebar />
+    </Layout>
+  );
+}
+```