[Twisted-Python] asynchronous response

Hey - I'm confused, so nothing new :) ...but I'm running at this example and I'm scratching my head.

http://twistedmatrix.com/documents/current/web/howto/web-in-60/asynchronous-...

I would've thought 2 requests could be served simultaneously, but when I fire off 2 requests the first received gets it's response after 5 seconds, while the second response takes 10 seconds.

I think I understand what's happening, but I don't know why...and I would love an example where the subsequent request doesn't have to wait for the first request to finish.

Thanks, Kevin