Version: 2018.3 (switch to 2019.1 )
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Development builds

Unity Cloud BuildA continuous integration service for Unity Projects that automates the process of creating builds on Unity’s servers. More info
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builds your projects for release by default. To create a development build, go to the build target’s Advanced Options. (See documentation on accessing and editing Advanced Options.)

The Edit Advanced Options screen
The Edit Advanced Options screen

Check the Development Builds box. When 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
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  • 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. See documentation on the Profiler window for more information on profiling your development build.