We do use JavaFX in an app for our customer. The application is not public, however. There are many aspects to UI performance. Unlike IntelliJ, our app has onl

We do use JavaFX in an app for our customer. The application is not public, however. There are many aspects to UI performance. Unlike IntelliJ, our app has only tens of widgets displayed at once - I can't compare in this regard. However, we have very big models, namely tables with >100000 of rows. Scrolling is smooth and initialization as well. From my experience, JavaFX allows you to write elegant code which still caches a lot of components. This is a strong performance benefit. My issue with JavaFX is a very well thought-out philosophy, translated into an API which is far from perfect. Once you go beyond "hello world" examples, you e.g. have to start type-casting. I'd love to see JavaFX v3 where these things would be sorted.