stackotterSwiftCrossUI's AndroidBackend has been hanging for a few hundred milliseconds (and sometimes over a second) after each view update, so @bbrk24 collected a flame graph to investigate further.
It turns out that Android's RelativeLayout view measures each of its children twice per measurement pass, leading to exponential time complexity when nested!
Switching to a custom ViewGroup implementation brought the offending measurement pass from ~500ms down to ~7ms.
