It has been a debate from long time that who is faster, asp.net or php?
So many times I have heard php guyes claim that php is so much faster than Asp.Net and that Asp.Net is clunky and slow.
I have collected few of important resource to make it very clear.
See basically both the development are different like two side of coin. Each of it have its own purpose to choose for your development need. It highly depend how is your requirement.
Any way check from here to get more detail on this debate.