Hi Daniel,
Sorry for the late reply, I have been busy and didn't have time to answer this post. Since the last update it might have solve the issue. I have found out that actually when there is a lot of geometry links between ArchiCAD and Grasshopper the programs will load for few minutes.
So I think that's good now but it needs a lot of time to make update. It will be nice to make this faster if possible.
Thanks again for your work.
Frank