It is too long time to load swc files (only Android)

We've had a similar experience with some apps on Android, and especially if you're doing a lot in your constructor or have a lot of items in your swc libraries, you can sometimes get much quicker loading times if you add a simple preloader to the app.

Since we use FlashDevelop we use a Frame metatag to add a preloader frame before the Main document class like this:

[Frame(factoryClass = "Preloader")]

And set up Preloader.as with preloading code as if it was for the web instead of an app (we use something similar to FlashDevelop's web preload template where Preloader extends MovieClip and then checking if currentFrame == totalFrames on enter frame before setting up the Main document class).  You don't really need to bother with loading bars or anything, as the app doesn't have much time to actually display anything the Preloader does.

This gives us much quicker loading times on Android builds -- something that would take 15-20 seconds to load on an ancient Kindle or slow Android device only takes 2 or 3 seconds for us after adding a Preloader.  Seems bizarre that it makes such a big difference on Android, but it does give a nice improvement to startup time if you're having trouble with an app.