A lot of early days Java apps built with Swing were slow and ugly. I think that's where a lot of the "java is slow" stories come from.
Of course, Jetbrains' products are a proof that you can use Java to build modern apps that are pretty good.
Of course, Jetbrains' products are a proof that you can use Java to build modern apps that are pretty good.
Specially because most developers couldn't bother to write proper Swing code, or reading blogs like "Filthy rich clients".