They gave some interesting talks about how it works. They put a ton of effort into sync engine and that’s why it’s so fast. Maybe you would find interesting bc note deck seems kinda similar in some ways …
Pretty impressed with https://linear.app so far. Performance is very fast. auto-imports from github which makes managing all of the damus issues a breeze. Even supports pull requests. Much easier to manage issues across teams and projects than github. Timeblocking calendar integration in morgen is a bonus. 
