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"Each island in the world is treated separately when the
simulation step is taken. This is useful to know: if there
are N similar islands in the simulation then the step
computation time will be O(N)."

An island is defined in the manual as a group of bodies connected
via joints, though it should be noted that two or more islands can
temporarily become a single larger island for the duration of a
simulation step if contact joints have been created between them
(~O(N^3) havoc then ensues).

HTH,
--Adam
-- 
Adam D. Moss   . ,,^^   adam at gimp.org   http://www.foxbox.org/   co:3
busting makes me feel good
kthx bye