---
id: request-waterfalls
title: Performance & Request Waterfalls
ref: docs/framework/react/guides/request-waterfalls.md
replace: { 'react-query': 'preact-query', 'React': 'Preact' }
---

[//]: # 'LazyExample'

```tsx
import { lazy } from 'preact/iso'
// This lazy loads the GraphFeedItem component, meaning
// it wont start loading until something renders it
const GraphFeedItem = lazy(() => import('./GraphFeedItem'))

function Feed() {
  const { data, isPending } = useQuery({
    queryKey: ['feed'],
    queryFn: getFeed,
  })

  if (isPending) {
    return 'Loading feed...'
  }

  return (
    <>
      {data.map((feedItem) => {
        if (feedItem.type === 'GRAPH') {
          return <GraphFeedItem key={feedItem.id} feedItem={feedItem} />
        }

        return <StandardFeedItem key={feedItem.id} feedItem={feedItem} />
      })}
    </>
  )
}

// GraphFeedItem.tsx
function GraphFeedItem({ feedItem }) {
  const { data, isPending } = useQuery({
    queryKey: ['graph', feedItem.id],
    queryFn: getGraphDataById,
  })

  ...
}
```

[//]: # 'LazyExample'