Why do so many people say Java is slow? What's slow? In fact Java compares fairly well against pretty much everything except C.
It's a memory hog, but it sure isn't slow, whatever that means.
Not against JavaScript or PyPy, from what I've seen.
You must think everything but well optimized, hard to write and read C/C++ is slow and bloated then. Which is fine if that is what you are comparing it to.