When testing and debugging your app, watch for these signs of excessive energy use:

• Battery drain

• Activity when you expect your app to be idle

• An unresponsive or slow user interface

• Large amounts of work on the main thread

• High use of animations

• High use of view opacity

• Swapping

• Memory stalls and cache misses

• Memory warnings

• Lock contention

• Excessive context switches

• Excessive use of timers

• Excessive drawing to screen

• Excessive or repeated small disk I/O

• High-overhead communication, such as network activity with small packets and buffers

• Preventing device sleep