Performance was my main concern with MST, most notably if your data modelling involves A LOT of entities, things can get slow: https://github.com/mobxjs/mobx-st

Performance was my main concern with MST, most notably if your data modelling involves A LOT of entities, things can get slow: https://github.com/mobxjs/mobx-state-tree/issues/440 https://github.com/mobxjs/mobx-state-tree/issues/440. Binding methods on every instance of an object is a lot of overhead. I really liked using MST when I spent a few days fiddling with it. However, I really don't want to get trapped with perf bottlenecks I can't easily fix. Whether I'd actually run into trouble - I have no idea, but vanilla MobX is excellent enough that I'm happy sticking with it. I'd love to use MST more though.