I can't comment on performance but it definitely allows for easier plugin development. Another thing I think this affects is some things like font rendering (e.g. you can now use ligatures if your font supports them) since they use their own custom JDK.
Downvoted again; try looking at it this way. Does the question need to be answered in such a way to be understandable by a five year-old? Does the question actually need to be prefixed in such a way? No, and no? Then let's not get drawn in to making people think for themselves less and expect a little more of them instead - this is how learning and real growth works.
