How can I improve performance with Virtua in React?

Use memoization with `useMemo` for item elements or employ render props to lazy-create elements. Decreasing the `bufferSize` prop can also help if components are heavy, as detailed in the README's FAQ section.

Virtua vs react-virtuoso: which is better for my project?

Virtua excels in zero-config setup and smaller bundle size, while react-virtuoso offers more built-in features like masonry and advanced tables. Choose based on whether you prioritize convenience or feature completeness.

Why are my Virtua list items squashed or rendered inconsistently?

This often occurs if you forget to pass unique `key` props or use indexes as keys, especially when prepending items. Ensure keys are stable and unique, as warned in the README's troubleshooting section.

Does Virtua support server-side rendering?

Yes, Virtua has SSR support and can render React Server Components as children, a unique advantage over some alternatives like react-virtuoso, according to the feature comparison table.

How do I handle dynamic item sizes with Virtua?

Virtua automatically measures and adapts to dynamic sizes without configuration. For best performance, set a height or min-height on items that resize often, such as lazy-loaded images, to reduce glitches.

What does the 'ResizeObserver loop completed with undelivered notifications' error mean in Virtua?

This is a common ResizeObserver issue per the spec and can be safely ignored. In webpack-dev-server, filter it out using the `devServer.client.overlay.runtimeErrors` option, as explained in the README.

Open-Awesome

virtua

MITTypeScript0.53.6

A zero-config, fast and small (~3kB) virtual list and grid component for React, Vue, Solid, and Svelte.

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3.8k stars121 forks0 contributors

What is virtua?

Virtua is a virtualization library that renders only the visible items in large lists or grids, dramatically improving performance and scroll smoothness. It solves the problem of rendering thousands of DOM elements by dynamically measuring and recycling items as the user scrolls. The library is designed to work seamlessly across multiple frontend frameworks with minimal configuration.

Target Audience

Frontend developers building data-intensive applications in React, Vue, Solid, or Svelte that require smooth scrolling through large datasets, such as dashboards, feeds, or data tables.

Value Proposition

Developers choose Virtua for its zero-config approach, tiny bundle size, and broad framework support, offering a drop-in replacement for native scrolling with built-in optimizations for dynamic sizing, reverse scrolling, and mobile compatibility.

Overview

A zero-config, fast and small virtual list, grid and masonry component for React, Vue, Solid, Svelte and Angular.

Use Cases

Best For

Rendering large lists with dynamic or unknown item heights
Building data grids with smooth horizontal and vertical scrolling
Implementing infinite scrolling feeds in React or Vue applications
Optimizing performance in dashboards with thousands of data points
Creating accessible virtualized tables with keyboard navigation
Supporting reverse scrolling (bottom-to-top) in chat or log viewers

Not Ideal For

Projects requiring masonry layout virtualization out-of-the-box
Applications that need advanced table components with minimal customization
Teams working with datasets that exceed browser's maximum element size limit
Production environments needing stable, non-experimental grid virtualization

Pros & Cons

Pros

Zero-Config Performance

Automatically handles dynamic sizing, scroll adjustments, and iOS support without manual setup, delivering smooth scrolling out-of-the-box as highlighted in the README's motivation.

Cross-Framework Consistency

Provides dedicated, behavior-consistent components for React, Vue, Solid, and Svelte, making it a versatile choice for multi-framework teams or projects.

Tiny Bundle Size

Each component is around 3kB gzipped and tree-shakeable, minimizing impact on application load times and bundle size, as emphasized in the feature list.

Flexible Scrolling Options

Supports vertical, horizontal, reverse, infinite, and window-based scrolling with smooth animations, catering to diverse UI patterns like chat feeds or data grids.

Cons

Experimental Grid Support

The grid component is labeled experimental, indicating potential instability or breaking changes, which makes it risky for production use compared to stable alternatives like react-window.

iOS Scroll Quirks

Reverse scrolling in iOS Safari requires users to release the scroll, as admitted in the README's comparison table, degrading the user experience in mobile applications.

Performance Tuning Overhead

For complex cases, developers must implement memoization and careful key management to avoid performance bottlenecks, adding development complexity beyond the zero-config promise.

Frequently Asked Questions

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