perf(Blocks,Block): add deep comparison to block/blocks memo call

[jakequade-pc]

Description

React.memo uses a shallow comparison, which isn't enough in this case.

Using welldone-software/why-did-you-render

I found our app home-screen content would update 12 times in one load with the wdyr message

"different objects that are equal by value".

This change adds a deep comparison, which when tested via patch-package, eliminated those re-renders.

Note: I tried to base this PR on the one that initially made these memo changes, hope it's okay :)

Screenshot

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Note

Medium Risk
Touches generated component wrapping and adds a new runtime dependency; deep comparison can change update behavior and has potential performance tradeoffs on large props.

Overview
Reduces unnecessary re-renders in the React Native SDK by switching Block and Blocks exports from memo(Component) to memo(Component, isEqual) using react-fast-compare (deep equality) via the Mitosis MEMOIZING_BLOCKS_COMPONENT_PLUGIN.

Adds react-fast-compare as a dependency of @builder.io/sdk-react-native and includes a patch changeset documenting the perf improvement.

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[changeset-bot]

🦋 Changeset detected

Latest commit: 77421c5

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

This PR includes changesets to release 1 package

Name	Type
@builder.io/sdk-react-native	Patch

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

[jakequade-pc]

cc @samijaber @sidmohanty11 just for visibility 😊 thanks for your time!

[nx-cloud]

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View your CI Pipeline Execution ↗ for commit 77421c5

Command	Status	Duration	Result
nx test @e2e/react-native-76-fabric	❌ Failed	4m 14s	View ↗
nx test @e2e/react-native-74	❌ Failed	4m 13s	View ↗
nx test @snippet/react	✅ Succeeded	1m 56s	View ↗

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☁️ Nx Cloud last updated this comment at 2026-02-05 05:05:13 UTC

[sidmohanty11]

thanks @jakequade-pc for the PR, looks good to me - tagging @midhunadarvin to take a look once on why the tests aren't running and help out

[midhunadarvin]

@jakequade-pc Could you rebase your branch with the main branch ? The e2e tests should run properly once you've rebased.

[jakequade-pc]

@midhunadarvin done! Thanks for your patience with this

[midhunadarvin]

@jakequade-pc There are a couple of E2E test workflows failing :
https://github.com/BuilderIO/builder/actions/runs/21690062241/job/62576597925?pr=4253
https://github.com/BuilderIO/builder/actions/runs/21690062241/job/62576597914?pr=4253

Could you take a look at the failing test cases and try to resolve them ? Let me know if you need any additional help.