Sure... IntelliJ IDEA startup isn't instant. Atom's startup isn't instant. QT Creator's startup isn't instant. GIMP starts in a few seconds... etc.
However, it's all besides the point because this tool takes Java (JVM) bytecode and translates it to WebAssembly, there's no JVM involved for end users at any point.
Sure... IntelliJ IDEA startup isn't instant. Atom's startup isn't instant. QT Creator's startup isn't instant. GIMP starts in a few seconds... etc.