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Slicing big updates and prioritizing some of them could also be achieved by tweaking the reactive core of Solid or Svelte.

Of course, but until those libraries actually do it I don't see the value in saying so. Any library could do it.

My point is that this feature is unrelated to vDOM, it happens to be implemented by a major vDOM lib.

But... I actually read your comment too quickly, you were not making that point :-)