What is the 'relative' cost of an editor instance, is there a limit?

Suppose instead of having a single PM editor instance, I have (potentially) very many instances on a page. Is there a hard limit with respect to this, and/or what is the cost (from a memory perspective) of multiple instances?

ProseMirror instances are lightweight. Splitting an editor up should, apart from the extra complexity needed to make the UX across them smooth, not cause problems.

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