With version 2.0 of Xamarin.Forms, it is now possible to optionally compile the XAML code into intermediate language with the XAMLC compiler. This feature is well documented on the Xamarin website. As a reminder however, here are the main advantages of compiling your XAML code:

And what does it do exactly? It triggers an MSBuild tasks which parses the XAML and generates the InitializeComponent method that create the page in code based on your XAML files.

So here it is friends: How to turn on XAML compilation at the assembly level.

using Xamarin.Forms.Xaml;
...
[assembly: XamlCompilation (XamlCompilationOptions.Compile)]
namespace MyFunkyApp
{
  ...
}

One line of code only to make your app potentially faster? Use it!