Several months ago, Google added an experimental runtime option to speed up apps in Android 4.4 KitKat. A runtime, for the record, supports the apps running on your device -- without it they'd be nothing but piles of useless code. Called ART (short for Android Runtime), that same mode will become the default when Mountain View releases the next version of its operating system. Developers spotted tweaks to Android's open-source code indicating the upcoming change, and the update looks to be a positive one. Without getting bogged down in details, ART essentially makes apps run faster and more efficiently, with the downside being that they'll take up slightly more space on your phone, as well as lengthier install times.