So i have a map generator that take a few seconds to generate and display. However, during these seconds the game completely freezes. Is there a way that i can do the calculation on a different thread and have the game not freeze when generating?
Any help is greatly appreciated! 
To multi-thread you can use Unity’s Job system.
(Unity - Scripting API: IJob)
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https://docs.unity3d.com/Manual/JobSystemSchedulingJobs.html
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and if you’re using jobs look into the burst compiler.
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Burst User Guide | Package Manager UI website