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Even with small trivial shapes (like a cube), the viewport is not smooth (it seems like every few frames, BricsCAD is making some calculation). This, however, become more apparent and really lagguish on more complex designs until it become nearly unusable.
To explain better the case, I uploaded a video (unlisted to not domage BricSys reputation), showing how it performs, and also comparing with the same mesh on Blender (60 fps perfectly smooth). In the video, you can see how slow it is to create a simple extrusion (x2 - x3 time).
As you may see, I tried to enable multi-threading, even setting 8/16 of the cores on my machine. This has no impact on the lags. I have the impression it is related to some access to the disk synchronously with the rendering loop (logs? or similar?)
Do you experience the same issue? and is there a way to improve this?