why python is slower than java?

[Maurice LING]

> In this way version 1.0 is all python. v1.1 has 20% C++; v1.2 is 34% C++
> ... until v2.0 is all C++. Each upgrades is faster, but does not introduce
> any new functionality and the risks that new functions imply.
> 
> If you were faithful to this concept, version 3 requires you to use the
> oldest python branch who's functions will not be modified, to start
> development. Could be v1.1 or 1.9. 
> 
I don't quite get the last part right, the version 3 part. I got lost in 
it....

thanks maurice