Originally Posted by jonajams
sorry, what? I'm not such a skilled user..
Ah, well, ART is a new experimental runtime introduced in Android KitKat (Which I'm assuming is the version you're using) Now i'm not entirely sure on how ART works (Someone feel free to correct me) but it basically store's all or most of the app to the system which allows the phone to access it faster compared to the current runtime (JIT
/Dalvik) which loads the app J
ime, every time you load it up.
Make sure to make a backup before you attempt this incase anything goes wrong resulting in your phone not being able to boot.
To enable the runtime, just navigate to Developer Options (If not alread enabled, go to Settings > About Device and scroll down to "Build Number" Tap that 7 times and it should give you a prompt telling you it's been enabled.
From there, navigate back to the settings menu and all the way to the bottom. You should now see a developer options listing. Click it and scroll all the way to the bottom to the "Apps" Category. Tap the option "Select Runtime" this should bring up a menu with the option to switch between runtimes. Now just press "Use ART" and press OK on the warning that pops up. You're phone will reboot and will now reinstall all and optimise all of your apps ready for ART mode. You will not lose any of your app data.