server parallel fetching

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):

  const header = await fetchHeader()
  return (
    <div>
      <div>{header}</div>
      
    </div>
  )
}

async function Sidebar() {
  const items = await fetchSidebarItems()
  return <nav>{items.map(renderItem)}</nav>
}

Correct (both fetch simultaneously):

async function Header() {
  const data = await fetchHeader()
  return <div>{data}</div>
}

async function Sidebar() {
  const items = await fetchSidebarItems()
  return <nav>{items.map(renderItem)}</nav>
}

  return (
    <div>
      
      
    </div>
  )
}

Alternative with children prop:

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>
      
      {children}
    </div>
  )
}

  return (
    
      
    
  )
}