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> but some sort of virtualization would probably be required in order to support millions of lines of code.

From my understanding, Lexical is a layer for the text document model and a pattern for transforming that text model. Updates to the model is where bottleneck comes about at VSCode / Ace scale.

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Lexical's model might become a bottleneck at some point, but we haven't done any extensive testing on huge models (I mean really huge, we know large models are fine). There are so many things folks want to do with text editors – from small plain text editors to WYSIWYG, to full blown code editors. We're hoping the community can help us fill in the blanks on some of these areas, as we're only a small team.

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