Not really, major IDEs have had incremental compilers for ages. Usually Maven compiles of our largest projects are also done in no-time.

You ought to put together a benchmark for that!

and GUIs.

At the time Java gained its fame, the GUI applications were unresponsive, not slow.

They could lock at any time, for a perceptible few hundreds of miliseconds, but had still a nice average speed.

Not when using GUI designers.