Java Swing? It was slow in 1999, which means it's fast now. It's also a much more sensible language than JavaScript. It's not native GUI, but neither is JavaScript anyway.

Swing has no place in a sentence about good usability. It may be the best of the worst, but it's not a positive example. Things like html or Imgui are better to use, with the former also being much more powerful and the latter being as simple as can be while still being blazing fast.