Consider the following: the smoothest UI/UX platform of the past decade has been iOS, which was pretty much built on ObjC. These types of speedups just aren't

Consider the following: the smoothest UI/UX platform of the past decade has been iOS, which was pretty much built on ObjC. These types of speedups just aren't necessary in that world. You'd drop to C or C++ if you needed it, which is trading convenience for complexity. You could want it to be faster, but it's not going to materially show itself in common workloads.