What is best practice in IIS? One application pool for each application, or a shared application pool?

Question

In IIS 7, what is best practice? Should I create an application pool for each application, or should I share an application pool with as much application as possible?

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Answer 1

Sharing Application pool is better than creating an application pool for each application for a fixed number of application

You can run as many application pools on your IIS 7 server as you need but this will affect server performance.On the other hand Application pools allow a set of Web applications to share one or more similarly configured worker processes but you should not share an application pool to a lot of application.Because This will affect your server performance too!

So in both way you have to be tactful.