adobe/react-spectrum

ComboBox/Select easily becames laggy

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#5,897 opened on Feb 16, 2024

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 (6 comments) (2 reactions) (0 assignees)TypeScript (1,500 forks)auto 404
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Description

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When the ComboBox or Select component have a bit more items, they easily become laggy, because the full list re-renders on a single item hover. This makes them not scale well with data. It's not the case with the standalone ListBox however, rendering is optimized in that. Only when it belongs to a ComboBox or Select. The rendering behavior can be observed by turning on the React DevTools "highlight updates" feature.

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Contributor guide

Research direction
Investigate the re rendering behavior in ComboBox/Select when hovering items, compare with standalone ListBox to identify the cause of full list re renders. Look for missing memoization or incorrect state updates.
Tech stack
reacttypescript
Domain
frontend
Issue type
Performance
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
React
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70