I have a friend that uses Titanium a lot, so yes, I only know of it second hand. The lack of a function/reactive componentized UI paradigm forces you to work w

I have a friend that uses Titanium a lot, so yes, I only know of it second hand. The lack of a function/reactive componentized UI paradigm forces you to work with native objects (the views) a lot. React can optimize how much it touches the bridge because you don't interface directly with the UI. From what I've seen, Titanium can't do nearly as good of a job as that because it's like the DOM. You touch the UI in several places and it needs to always talk across the bridge. I never said it doesn't run JS on a separate thread. React performs layout on a separate thread, providing the flexbox layout algorithm. EDIT: It's all of these little details that can make or break something like this.