Development builds

Unity Cloud BuildA continuous integration service for Unity projects that automates the process of creating builds on Unity’s servers. More info
See in Glossary builds your projects for release by default. To create a development build, go to the build target’s Advanced Options and check the Development Builds box.

When the Development Builds box is enabled, this sets two flags in the BuildOptions API:

• Development: A development build includes debug symbols and enables the ProfilerA window that helps you to optimize your game. It shows how much time is spent in the various areas of your game. For example, it can report the percentage of time spent rendering, animating, or in your game logic. More info
  See in Glossary.

• AllowDebugging: Allow script debuggers to attach to the player remotely.

Note that to profile a web player build, you need to have the development version of the web player installed. You can only profile the .unity3d file when the development web player build is active. For more information on profiling your development build, see Profiler window.