We are working on the lightweightness. We currently throw away a bit of startup performance due to the way we load classes at runtime. That being said, 23ms is quite reasonable i guess.
I don't think the size is horrible, though for mobile, smaller executables do reduce breakage. I haven't tried converting a large app, but I assume even a big jar is a small incremental increase in exe size.
23ms is is pretty good. To compare, Hello World in Python, converted to a native executable has a launch time of 6ms (284k executable size). So there might be some room for improvement. RoboVM is still amazing.
