Currently rendering on RaspberryPi is quite slow, much slower than we know it can support. Research ways to improve this and increase the rendering FPS by at least double (it should be possible to increase ten times).
You will need a RaspberryPi computer to work on this task. Using an SD card image for Sprout, start by building libsoy from Mercurial which will allow you to modify and test your changes.
While working on this task you should join and remain in #CopyleftGames on Freenode to get help, feedback, and guidance from mentors and other developers. Code updates which may affect your work are also announced here as they happen.
When you've done, commit your work and post the resulting changeset url to this task.