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For tracking, you can use the Solver system. Depending on your needs, you may need to use RadialView. For more solvers, please refer to Solver overview - MRTK 2 | Microsoft Learn. If you have any questions about the Solver system, please feel free to let us know.
Also, if you are using the Development Build, there may be performance issues, you can try to build and deploy the application as release.
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