They can be issued concurrently. Tor doesn't care.
Indeed; I will see vidalia show a lot of connectings all at once, followed by all switching to open at once (TCP streams inside a tor circuit). The overhead to open a new TCP HTTP connection through a tor circuit seems to be very long. I know it has to be encrypted/decrypted at each node, as well as originated at the exit to the destination, but I have to wonder: Can this be sped up at all? The discussion about fast nodes: Is there a way to tell the client, "Only select fast nodes"? Does "fast" imply high throughput (but it might be slow to start up), or fast startup/turn around?
