I have recently been trying out the src executing capabilities of orgmode. I
have been confused why a python session takes significantly longer to
execute than a non python session. For example

#+begin_src python
return 2+2
#+end_src

executes pretty quickly, but
#+begin_src python :session test
2+2
#+end_src

executes twice as long. Looking at the command shell for python, it seems
that the time is being taken to actually send the source to the command
shell buffer. Once its sent (or once i can see it displayed in the command
shell buffer) it immediately returns. Any ideas?