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The performance on mobile doesn't look great for me (significant delay between key stroke and rendering, on iPhone X), also this particular page could be more responsive and mobile friendly.

Otherwise I love the idea of block-based editor and clean output.

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You're right. I expect that they're reconciling with their model in JS on every keystroke. I know Quill does an interesting thing where the DOM is the canonical model, and the JSON model is actually derived from the DOM by a strict transformation. Because of that, it works a bit more naturally with many native mobile editor interfaces.

Yea, it was even causing my keyboard to lag. Keystroke queued up, but the key press state (enlarged visible letter above your finger) was really delayed.

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