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1. What device are you using? A big factor is the environment in which you are trying to initialize. Here's some information on the type of environment that works best for Chalk: https://support.ptc.com/help/vuforia/chalk_desktop_center/#page/Vuforia_Chalk_Desktop%2Fcommon%2Fann...
2. Try moving Chalk to A/V only mode and run a test call. Are you seeing the same performance issues, or does the Audio & Video work similar to other A/V applications?
3. At this time session are only a 1:1 call. Multi-user sessions is something that is on the roadmap for future releases of Chalk