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TOR protocol simulation

Hi everybody,
i am working on a simulation project on TOR.
I read all the documentation but there are still some thechnical question i
would like to ask.

1 - Tor uses cells of 512 bytes and they are encrypted.
I am wondering how much this encryption takes on an average machine.
If the time involved is relevant compared to the time of transmission
i 'll have to deal with that in order to get significant results.

2 - How does it decide the circuit and how long is it?
It seems a totally random decision but it must have some policy enforced
like the number of nodes or which ones? am i right?

3 - The circuit is changed every minute right? how often do the OP start a
new circuit construction? And if there is no traffic does it stick with
the old
circuit or does it keep on changing it?

4 - Since i want it to be accurate i am intrested in your policies for rate
limiting and fairness. I am talking about the bucket approach and the
euristich to distinguish an interactive stream.

5 - The same is about congestion control. I could simulate the protocol
without it but it seems very important in order to decrerase latency.

Thanks to everybody who'll answer my questions.

Marco Fiscato.