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Review Optimizing Build Times for IL2CPP for more info.
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The following instructions let you develop using a single Visual Studio instance, reducing the frequency of exporting Unity projects and improves the debugging experience. By default, two instances of Visual Studio are required - one instance to modify Unity scripts and another to deploy to the device and debug. When you're creating a mixed reality application with Unity, you need to switch between Unity and Visual Studio to build and deploy the app package to HoloLens or an immersive headset.
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