I would like to give sources for what I'm saying but I just dont have them, it's something I heard.
Once a programming professor told me that some software benchmarking done to .net vs Python in some particular items it gave a relation of 5:8 in favor of .NET . That was his argument in favor of Python not being so much slower than .NET
Here it's the thing, I would like to try IronPython since I could combine the web framework I know the most (asp.net) with the language I like the most (Python) and I was wondering about the speed of programs in asp.net in Python vs the speed of programs in ASP.NET with VB.net or C#. Is there any software benchmarking on this? 
Also, shouldnt the speeds of IronPython compared to other .NET languages be similar, since IronPython unlike Python have to compile to the .NET intermediate code? Can someone enlight me on these issues?
Greetings
IronPython will be considerably slower than C#.  You could think of the comparison as very roughly between CPython and C, but with the gap somewhat smaller.
How does ironpython speed compare to other .net languages?