Yeah, the document loaded in the editor is nearly 1 MB by now. This document has grown over the last months. Over the last days there were 100 users concurrently typing in the document, some times pasting in 20k words, deleting it, pasting it in again … And Y.js (what we use) stores the whole history, and currently is blocking the main thread until the first state is downloaded and applied.

I create a new document, wait a moment …