Im making progress, moving up from the hardware to the software topic..

Ive now got os3.9 working fine, together with cgx4. But Ive noticed from time to time, the mousecursor freezes for a second. This can happen when extracing lha, clicking a link in Netsurf, etc.
What could be causing this? Are there known issues with AsyncWB for example? My guess is it has something to do with this. But it could also be some misconfiguration in the CGX tooltypes, for example.
Speaking of which, how do I enable screendragging?