I am using the software on my laptop and it uses 100% of a single cpu when idle. Even with zero blocks added to the scene, the laptop will heat up and turn it's fan into overdrive.
As a comparison:
Blender uses 3-15% of a single CPU while idle.
The Godot engine uses 15% idle CPU and 85% cpu when moving the camera.
Why would Assetforge need to use this much CPU? Can you disable redrawing of the screen when there is no user input?