I had some performance problems with Ubuntu 12.04 when my battery started to run out. To help this I installed Jupiter and change to Maximum Performance.
For details see http://www.webupd8.org/2010/07/jupiter-ubuntu-ppa-hardware-and-power.html.
And if you like to change the default Icon simply replace the /usr/share/pixmaps/bolt1-4.png files. For details see http://askubuntu.com/questions/127449/how-can-i-change-the-icon-for-jupiter.