This is source code of performance monitor, that I used in my project (http://www.jpct.net/forum2/index.php/topic,2926.0.html). By the class you can record CPU core load and VM memory usage. Rendering graphs is on you. Example contains very simple graphs, but they are well suitable only on 720p display.
As an example was chosen Physics example (http://www.jpct.net/forum2/index.php/topic,2622.0.html), because physics calculations highly loaded CPU and is evident, that jBullet has no multi-core support.
(http://s8.postimage.org/o3746g2s1/device_2013_02_03_174221.jpg) (http://postimage.org/image/o3746g2s1/)
sources
http://dl.dropbox.com/u/26148874/PhysicsTest.zip
Great! Thank you very much!