RELATED IDEAS
Elevated CPU usage while idle
Please resolve CPU usage while idle (Defect Report 988857)
Seems it is not related to 3D view but to Spatial framework 3D view. Open it up then switch to other tab and close the project(without closing CC) and CPU will still be used excessively by CC Master.
Bentley lower you carbon footprint and stop exxcesive use - https://blog.bentley.com/insights/bentleys-net-zero-resolution/