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PHP and a lengthy process (Python, Java, etc.)?

I would like your opinion on writing web applications in PHP and a lengthy process using tools like Django or Turbogears for Python.

As far as I know: - In PHP, pages are extracted from the hard drive every time (although I assume that the OS stores files in RAM some time after they were available) - Pages are recompiled into the operation code every time (although tools, for example, Zend can store the compiled version in RAM) - Getting pages every time means reading global data and session data every day and reopening database connections

So, I believe that PHP makes sense on a shared server (multiple sites sharing the same host) to run applications with moderate use, while a lengthy process provides better performance for applications running on a dedicated server and under heavy use?

Thanks for any feedback.

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