When should I use Async Controllers in ASP.NET MVC?

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I have some concerns using async actions in ASP.NET MVC. When does it improve performance of my apps, and when does it not?

  1. Is it good to use async action everywhere in ASP.NET MVC?
  2. Regarding awaitable methods: shall I use async/await keywords when I want to query a database (via EF/NHibernate/other ORM)?
  3. How many times can I use await keywords to query the database asynchronously in one single action method?

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