Which is faster, python webpages or php webpages?
Does anyone know how the speed of pylons(or any of the other frameworks) compares to a  similar website made with php?  
I know that serving a python base webpage via cgi is slower than php because of its long start up every time.
I enjoy using pylons and I would still use it if it was slower than php. But if pylons was faster than php, I could maybe, hopefully, eventually convince my employer to allow me to convert the site over to pylons.
There's no point in attempting to convince your employer to port from PHP to Python, especially not for an existing system, which is what I think you implied in your question.
The reason for this is that you already have a (presumably) working system, with an existing investment of time and effort (and experience). To discard this in favour of a trivial performance gain (not that I'm claiming there would be one) would be foolish, and no manager worth his salt ought to endorse it.
It may also create a problem with maintainability, depending on who else has to work with the system, and their experience with Python.
Which is faster, python webpages or php webpages?