Efficient List Rendering in React: react-infinite-scroll-component vs react-virtuoso vs react-window

When building modern web apps, you’ll often face a choice: how do you efficiently render long lists without slowing down the browser? The three libraries — react-infinite-scroll-component, react-virtuoso, and react-window — each offer different strategies. One isn’t universally “better”; the right pick depends on your data, UX needs, and performance constraints.

🎯 Core Philosophy: What Problem Are You Solving?

react-infinite-scroll-component assumes you’re loading data in chunks (e.g., from a paginated API) and just need a way to detect when the user has scrolled near the bottom to fetch the next page. It does not virtualize — it renders every item you give it. So if you load 10 pages of 50 items each, all 500 DOM nodes stay in memory.

// react-infinite-scroll-component: Simple infinite scroll
import InfiniteScroll from 'react-infinite-scroll-component';

function MyList({ items, loadMore, hasMore }) {
  return (
    <InfiniteScroll
      dataLength={items.length}
      next={loadMore}
      hasMore={hasMore}
      loader={<div>Loading...</div>}
    >
      {items.map(item => <div key={item.id}>{item.name}</div>)}
    </InfiniteScroll>
  );
}

react-window takes the opposite approach: it only renders what’s visible (plus a small buffer), no matter how large your dataset. But it requires you to know or fix the height of each item ahead of time.

// react-window: Fixed-size list
import { FixedSizeList as List } from 'react-window';

const Row = ({ index, style }) => (
  <div style={style}>Row {index}</div>
);

function MyList({ itemCount }) {
  return (
    <List
      height={600}
      itemCount={itemCount}
      itemSize={50}
      width="100%"
    >
      {Row}
    </List>
  );
}

react-virtuoso sits in the middle: it virtualizes like react-window, but automatically measures item heights and supports dynamic content, headers, and more — all with less boilerplate.

// react-virtuoso: Auto-sizing list
import { Virtuoso } from 'react-virtuoso';

function MyList({ items }) {
  return (
    <Virtuoso
      style={{ height: 600 }}
      data={items}
      itemContent={(index, item) => <div>{item.name}</div>}
    />
  );
}

📏 Handling Dynamic Item Heights

This is where the libraries diverge sharply.

react-window forces you to choose between two components:

• FixedSizeList: all items same height (fastest)
• VariableSizeList: you must provide an itemSize function that returns the height for each index

If your content height depends on text length or images, you’ll need to pre-calculate or cache sizes — which adds complexity.

// react-window: Variable size list
import { VariableSizeList as List } from 'react-window';

const getItemSize = (index) => {
  // Must return exact pixel height for index
  return Math.random() * 50 + 30; // Not realistic — you’d use real logic
};

const Row = ({ index, style }) => (
  <div style={style}>Dynamic row {index}</div>
);

function MyList({ itemCount }) {
  return (
    <List
      height={600}
      itemCount={itemCount}
      itemSize={getItemSize}
      width="100%"
    >
      {Row}
    </List>
  );
}

react-virtuoso measures items automatically after they render. No need to guess heights — it works out of the box with variable content.

// react-virtuoso: Handles dynamic heights automatically
import { Virtuoso } from 'react-virtuoso';

function MyList({ messages }) {
  return (
    <Virtuoso
      style={{ height: 600 }}
      data={messages}
      itemContent={(index, message) => (
        <div>
          <p>{message.text}</p>
          <small>{message.timestamp}</small>
        </div>
      )}
    />
  );
}

react-infinite-scroll-component doesn’t care about heights — it renders everything. So dynamic heights are trivial to implement, but performance suffers as the list grows.

🔁 Combining Infinite Scroll with Virtualization

What if you want both infinite loading and virtualization? Only react-virtuoso and react-window support this natively.

react-virtuoso makes it easy with the endReached prop:

// react-virtuoso: Infinite scroll + virtualization
import { Virtuoso } from 'react-virtuoso';

function InfiniteVirtuosoList({ items, loadMore, hasMore }) {
  return (
    <Virtuoso
      style={{ height: 600 }}
      data={items}
      itemContent={(index, item) => <div>{item.name}</div>}
      endReached={() => hasMore && loadMore()}
      components={{
        Footer: () => hasMore ? <div>Loading more...</div> : null
      }}
    />
  );
}

react-window requires manual scroll tracking using onItemsRendered and managing your own loading state:

// react-window: Manual infinite scroll
import { FixedSizeList as List } from 'react-window';
import { useEffect, useState } from 'react';

function InfiniteWindowList({ items, loadMore, hasMore, totalItemCount }) {
  const [loading, setLoading] = useState(false);

  const handleItemsRendered = ({ visibleStopIndex }) => {
    if (!hasMore || loading) return;
    // Trigger load when near the end
    if (visibleStopIndex >= items.length - 5) {
      setLoading(true);
      loadMore().finally(() => setLoading(false));
    }
  };

  return (
    <List
      height={600}
      itemCount={totalItemCount}
      itemSize={50}
      width="100%"
      onItemsRendered={handleItemsRendered}
    >
      {({ index, style }) => <div style={style}>{items[index]?.name || 'Loading...'}</div>}
    </List>
  );
}

react-infinite-scroll-component cannot be combined with virtualization — it’s either/or. If you try to wrap a virtualized list inside it, you’ll break scrolling detection.

🧱 Advanced Layouts: Headers, Footers, Grouping

Need sticky section headers? Or a “Load More” button at the bottom?

react-virtuoso supports this via the components prop:

// react-virtuoso: Custom header and footer
<Virtuoso
  data={items}
  itemContent={(index, item) => <Item {...item} />}
  components={{
    Header: () => <div className="sticky-header">Top</div>,
    Footer: () => <button onClick={loadMore}>Load More</button>
  }}
/>

It also has built-in support for grouped lists with sticky group headers.

react-window requires you to manually compose headers/footers outside the list or use react-window-infinite-loader (a separate package) for more complex scenarios.

react-infinite-scroll-component lets you put anything inside its children, so headers and footers are easy — but again, everything stays in the DOM.

⚙️ Performance and Control

• react-window is the fastest because it avoids layout thrashing and uses pure components. But you trade convenience for control.
• react-virtuoso is slightly slower due to runtime measurements, but the difference is negligible for most apps, and it saves you from writing error-prone sizing logic.
• react-infinite-scroll-component has no performance optimizations — it’s just a scroll listener. Fine for short lists (<100 items), unusable for long ones.

🛑 When to Avoid Each

• Avoid react-infinite-scroll-component if your list can grow beyond a few hundred items. It will cause jank, memory bloat, and slow re-renders.
• Avoid react-window if your items have unpredictable heights and you can’t pre-compute them reliably. You’ll spend more time debugging sizing than building features.
• Avoid react-virtuoso only if you’re in an extreme performance scenario (e.g., rendering 10k+ rows in a trading dashboard) and can guarantee fixed heights — then react-window might edge it out.

✅ Summary Table

💡 Final Recommendation

• If you’re loading pages from an API and showing <200 total items: react-infinite-scroll-component is quick and simple.
• If your list has variable content, unknown heights, or needs rich UI (stickers, groups): react-virtuoso is the smoothest experience.
• If you’re building a high-performance table or timeline with uniform rows: react-window gives you raw speed and control.

Don’t mix infinite scroll with non-virtualized rendering — it’s a common anti-pattern that leads to degraded performance over time. Choose virtualization early if your dataset could grow large.