Tentative conclusion after being burned in performance too many times: Diffing (like in React, but by no means is this unique to React) is a sign that there's something wrong with your framework design.
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thanks! agree with the initial statement, though I'd go further: diffing absolutely has a cost, but my understanding is the thing that *really* kills perf in many apps is re-rendering the virtual DOM, not diffing it. there are other ways to achieve a similar programming model
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