Python / Django slow ? Deciding my next technological stack

Hi,

i'm going to invest lots of time and energy in various web projects (mostly community web sites), and want to pick up a language / framework and invest heavily on it.

I've spent a lot of time evaluating the various options, and narrowed my choice to 2 stacks: C sharp asp.net  MVC or Python / Django.

I'm more attracted to Python / Django combo, because of the Python language, and high level framework Django. I really want to use these.

My only concern is speed. I read that Python can't run concurrent tasks, is this true ? So a multi-processor with hyperthreads won't benefit the stack and even slow it down ?

I have no clue how this translates in reality, but should I expect noticable performance difference on a same server, shall I use Python / Django than if I had C Sharp Asp.net ?

I don't want to invest lots of time and efforts only to discover in the end that the site is slow. 
You that have real world experiences with running sites, what are your conclusions ?

I expect sites to be medium traffic: could be handled by a good dedicated server or average cloud ressources.

Benj

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