title: what is Android Studio Instant Run?
body: <p>Today I have updated my Android Studio and run the app which existing with previous version.When I was running the app with previous version app launching very fast but when I updated android studio and run the same app with updated version then app was taking too much time to launch.I googled for the issue and found that if instant run is enable then disable this so I have done the same and app launched as fast as it was.</p>
  <p>Now my question is-</p>
  <ol>
  <li>What is instant run?What are pron and cons to use it?</li>
  <li>Why app taking too much time to launch when instant run was enabled and when i disabled it then why it launched the app fast as it was.</li>
  </ol>