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What is the limit of circuits. For example if I open 100 unique domains will TOR make 100 different circuits or does this have some upper limit?

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In Tor Browser, every domain gets it's own circuit. The Design and Implementation of the Tor Browser document has some more details on it.

Frankly, you get an own circuit for every domain shown in the address bar. So, if you visit google.com a different circuit is used than when you visit example.com even when content, like an advertisement, is loaded from google.com.

I do not believe that there is a limit or at least not one you're likely to ever hit.

  • Is there any downside to using a circuit for each domain? Like performance wise or security wise? Because the default tor daemon only opens 5 circuits and the number of circuits does not exceed that number. – George J. Adams May 1 '17 at 21:29
  • There can be a slight performance hit because you need to build more circuits but Tor builds spare circuits that can be used when you visit a different domain making it pretty efficient. Security should be better since it is harder to correlate the traffic to the user when traffic I split among many exits. Tor exceeds 5 circuits here, how did you measure/observe the 5 circuits? – Peter Gerber May 1 '17 at 22:45

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