What's wrong with egui's virtual lists? It has support for them. https://docs.rs/egui/0.25.0/egui/containers/scroll_area/stru...

Unfortunately, it seems GPUI is no longer in development.

Iced looks great, but the developer is very open about it being a personal project (https://book.iced.rs/philosophy.html). That is appreciated, but for companies or even individuals wanting to adopt it, it's a big hurdle to get across.