Braitenberg vehicles

i am new to Breve and have been playing about with the Braitenberg
vehicle examples and tutorials....i wanted to create two vehicles to
give different behaviour, but when i ran the simulation with both
vehicles in it ran VERY slowly and incorrectly on my system.  To
create the second vehicle i just copied all the various steps in the
tutorial to a second vehicle ('vehicle2') and renamed the wheel and
sensor names accordingly for the new model.

Does this simulation usually become very intense with more than one
vehicle or have i overlooked anothe aspect of the problem?

any help would be great.
Thanks.
Cav

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