I think that as a corporation promoting the use of AI, they should actually be AI users themselves. They should just rewrite that laggy UI in Svelte, Solid, or even vanilla JS. Any of those would work.
Having said that, UI gripes aside, it works fine as a less complicated replacement for github.
Also their diffing, they use "..." diffing, and ".." is not apparently there in their GUI. As a git diffing tool I found this very odd.