The problem is that you have to recalculate the world at each update. In Clojure you have immutable datastructures that help. On the webstack you have React and reconciliation. All solutions come with a performance overhead. There are some interesting hybrid systems where you can try to isolate derived states and cache intermediate states (ex: Pathom for declarative state management and caching, and extension lifecycles in CLJFX for isolating UI subtrees)