In addition to what everyone else has been said, if you feel like contributing work on a Java port, go right ahead! It is an open source project, and that is how things go. Someone finds something interesting, does it, and then contributes back.

Incidentally one of the desires of the Parrot project is to be faster than Perl. So far they claim to be succeeding with speedups in the range of 20-50% for identical byte code. (Of course there are enough overall design differences that we won't have any concrete idea how fast Perl 6 will or won't be for a long time.)