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Not really at this point. Actually Object.preventExtensions() was part of the recent performance issue in React's dev mode (https://crbug.com/v8/8538 ). It's performance neutral at best right now.
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That is not to say it cannot help to speed up some things. But I'd consider it a DX feature rather than a performance feature.
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What is "DX"?
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Developer Experience
2:07 PM - 5 Jan 2019
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