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
ResearchGate
Implementation Details
Choosing efficient data structures is critical when implementing a CRDT. The following document gives an overview of the data structures used in Yjs.
yjs/INTERNALS.md at main · yjs/yjs
GitHub
Internals Visualization
Visualization of different CRDT algorithms (including Yjs/YATA and Automerge/RGA).
https://text-crdt-compare.surge.sh/
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.