Jane Street has been publishing some interesting projects recently. See Signals and Threads podcast State Machine Replication, and Why You Should Care [0] posted 2 days ago.
I came across the incr_dom library [1], which efficiently calculates the diff on the projected DOM based on a diff of the model data, sorta like React but more... mathematically grounded (?). incr_dom was then reformulated in Bonsai [2] which refactors and generalizes the idea to work with more than DOM. There was a recent Signals and Threads podcast about it a few months ago [3].