With the latest update in Android, Google has changed the runtime to ART from Davlik, which makes the device run 4 times faster than before. If your device has been running Android KitKat, you have the option to change your runtime to ART. For detailed info, give it a look.
We can get the detailed statistics related to our device like phone information, battery information, usage statistics and WiFi information by just dialing ##4636## This is a handy USSD to get the details about battery usage, DNS check, Ping, Application time, usage time and so on. For more info, give it a look.