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I have had the iPad Air for 2.5 years. When I first got it, it had iOS 7. Over time, I gradually updated it with larger updates, which made the iPad very slow and overloaded. Now I have iOS 10.2, and until a few days ago, it was very slow. That's why I did some research and found the following settings and applications that slow down the iPad.

1) Reset the settings.
2) Completely close iCloud and the App Store.
3) Turn off Siri.
4) In accessibility, turn off everything in search and spotlight, voice over, speech, and in the rest, press NO.
5) Turn off app refresh in the background.
6) Turn off all notifications except for messages, mails, YouTube, phone, and any other notifications you want to receive.
7) Turn off location services.
8) Turn off dictation.
9) Turn off Game Center.

As for applications, Facebook makes the iPad very slow, and you can replace it by downloading Friendly, which is simpler and similar to Facebook.
https://appsto.re/gr/6QH2x.i

A program to clean your mobile and iPad. For the iPad, if it doesn't remove the application, search for "power clean" and change it to iPhone only in the top left corner where it says iPad.
https://appsto.re/gr/NFWDcb.i

Regarding the App Store, if you deactivate your account, you can transfer applications from your computer.

Other than that, the iPad now works great. The battery lasts for 8-10-12 hours depending on usage. The speakers are very loud, and the 4G is very fast. The only negative is that the camera takes very bad photos in low light.