I want to thank you the upgrade to make UI more faster than ever but I think using python as a main language prevents the UI could be faster it could be with static typed language. Zero Pi has very low RAM resources, so static typed language implementation could optimize the memory usage, beside the speed of the UI-ness.
If you choose rust you can also check no memory leaks are present. So better for anyone.
Consider this as a wish in the future, because there is so much work to do. But it could be an incredibly huge advance.
Thanks