Internals

Implementation Details - The inner working of Yjs
CRDT Paper
Yjs is a CRDT implementation. It implements an adaptation of the YATA CRDT with improved runtime performance.
(PDF) Near Real-Time Peer-to-Peer Shared Editing on Extensible Data Types
PDF | Near real-time collaboration using Web browsers is becoming rapidly more and more popular for many applications such as text editing, coding,... | Find, read and cite all the research you need on ResearchGate
www.researchgate.net
Implementation Details
Choosing efficient data structures is critical when implementing a CRDT. 
yjs/yjs
Peer-to-peer shared types. Contribute to yjs/yjs development by creating an account on GitHub.
github.com
Optimizations Overview
JavaScript manages memory automatically using a garbage collection approach. Yjs is a particularly efficient implementation of the YATA CRDT that works well in the browser and in NodeJS. This article analyzes the performance of Yjs in JavaScript. 
Are CRDTs suitable for shared editing?
Performance analysis of the Yjs CRDT in practice and in the worst case scenario.
blog.kevinjahns.de
Codebase Walkthrough