[alexcarpenter]

Description

Selecting a Table row re-rendered every row, because each row read the selection and expanded state from the table context, which changed on every click. Rows now read that state from a store through useStore (added in #10621), and the context value stays stable, so only the rows whose state changed re-render.

• Time from a row checkbox click to the next frame, in Chromium at 4× CPU (median):

  Rows	Before	After
  10	27ms	8ms
  50	96ms	8ms
  200	344ms	13ms

• The feature tables (organization members, requests and invitations, API keys) show 10 rows per page, so they already missed a frame on every selection.

• Event handlers that only need the current selection read it with store.get() when the event fires, so they don't subscribe.

Stacked on #10621.

Checklist

• pnpm test runs as expected (@clerk/mosaic).
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other: performance

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated
clerk-js-sandbox	Ready	Preview	Nov 3, 2026 11:07pm UTC
swingset	Ready	Preview	Nov 3, 2026 11:07pm UTC

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

Run configuration

• Source mode: Auto
• Repository: clerk/javascript
• Branch: carp/mosaic-table-row-cache
• File: .coderabbit.yaml
• Commit: 401320e
• Layers: Repository YAML (base), Organization UI (inherited)
• Review profile: ASSERTIVE
• Plan: Team
• Run ID: e28ded49-4715-49aa-9331-e4d423e577bf

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• Trigger review

• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

[changeset-bot]

🦋 Changeset detected

Latest commit: 401320e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@clerk/mosaic	Patch
@clerk/swingset	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[blacksmith-sh]

Row selection reaches the next frame faster

Differs — Selection got much faster with identical end state, but at 200 rows the median is 42.5ms after (still over two frames), not the claimed 13ms, even though this machine ran the before case faster than the PR's numbers.

_Merge-base

_{This PR 401320e9}

Also checked · 2 match

Only the clicked row re-renders
Select all, range and keyboard selection still work

_{Proof on 401320e9 · Did Proof get it right? Yes · No}

View full Proof report

[alexcarpenter]

Closing: this was built on the store from #10621, which was replaced with context + memo. A Table version needs selection split out of the context Table.Body reads; that will be a separate PR if we pick it up.