[pqb]

Slate.js, even after change to Immer is slow. IMHO (as a person who actively observes the development, sometimes participate in their Slack) the "performance" is not taken seriously in this project. In last few months they provided few PRs that improved few cases, while breaking others. I am impressed how many projects are using it [0], because it has problems to handle editing and pasting huge documents. I also see many PRs from community focusing on optimization but they are ignored, stalled or prematurely closed. It also does not handle IME properly, which is a major problem for many languages. However, I see maintainers started to be more active, so all problems I have mentioned might be fixed soon.

[0] For example Kitemaker https://blog.kitemaker.co/building-a-rich-text-editor-in-rea... (AFAIK they use v0.47).

[1] Edit: TinyMCE team is focused to build their editor based on Slate - https://www.tiny.cloud/blog/real-time-collaborative-editing-...