Startup time logging is the length of time that it takes an application to start up.
Startup time logging in Android devices include the duration or total time from the time the application launches. There are two types of Startup time logging:
Real: This is the actual wall or clock time, similar to a stopwatch used for calculating the time.
User: This is the time an application or one of its threads has spent on a CPU core. This can be higher than the Real time if multiple threads are busy when an application is starting up.