The poster was commenting on the maintainability of the C++ code. Unfortunately, poorly written/structured code can still be as performant as well designed code.
As for your C++ vs Java question... put very simply, C++ will be faster than languages like Java when it comes to graphics and any software that is close to the hardware.
As for your C++ vs Java question... put very simply, C++ will be faster than languages like Java when it comes to graphics and any software that is close to the hardware.