Its totally experimental and they call it a substrate vm. You can see references to them on some graal truffle slides. These have startup performance in the sam

Its totally experimental and they call it a substrate vm. You can see references to them on some graal truffle slides. These have startup performance in the same ball park as mri ruby. project jigsaw is a project to make the java vm start faster by splitting the big rt.jar in many. The rt.jar is where all the standard java claasses are stored. Benefits better security and control