[Rails] Ruby on Rails and scalability problem

Hi,

Is ruby slower than PHP.
Is ruby on rails slower than PHP framework like zend framework?
Is ruby on rails slower than ASP.NET?
Is ruby on rails slower than Java?

Can anyone give practical comparison with other languages?

What are the scalability problems with ruby or ruby on rails. Did you
face any problem with ruby or ruby on rails for big projects?

Thank You.

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