Question 1

How can I improve performance with Virtua in React?

Accepted Answer

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.

Question 2

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

Accepted Answer

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.

Question 3

Why are my Virtua list items squashed or rendered inconsistently?

Accepted Answer

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.

Question 4

Does Virtua support server-side rendering?

Accepted Answer

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.

Question 5

How do I handle dynamic item sizes with Virtua?

Accepted Answer

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.

Question 6

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

Accepted Answer

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.

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