Unity supports a modern .NET runtime. You may encounter the following issues when using the .NET runtime:
The stable scripting runtime comes with a larger .NET class library API than the legacy scripting runtime. This means the code size is frequently larger. This size increase may be significant, especially on size-constrained and Ahead-of-Time (AOT) platforms.
To mitigate code size increases:
Choose the smallest .NET profile possible (see .NET profile support). The .NET Standard 2.0 profile is about half the size of the .NET 4.x profile, so use the .NET Standard 2.0 profile where possible.
Enable Strip Engine Code in the Unity Editor Player settings (go to Edit > Project SettingsA broad collection of settings which allow you to configure how Physics, Audio, Networking, Graphics, Input and many other areas of your Project behave. More info
See in Glossary, then select the Player category). This option statically analyzes the managed code in the Project, and removes any unused code.
Note: This option is only available with the IL2CPPA Unity-developed scripting back-end which you can use as an alternative to Mono when building Projects for some platforms. More info
See in Glossary scripting backendA framework that powers scripting in Unity. Unity supports three different scripting backends depending on target platform: Mono, .NET and IL2CPP. Universal Windows Platform, however, supports only two: .NET and IL2CPP. More info
See in Glossary.
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