I have AutoCAD Architcture 2011 on a brand new and powerful gaming pc and have also run accross insanly slow hatch issues. Running hatch command, picking internal points, and finaly drawing were all slow.
My issues i believe is hatching on site plans with many polylines and objescts in general. Autocad seems to have to look at every boundary it can to just draw a hatch (lame).
This website helped me with some settings to get it faster.
The things that worked for me were:
HPQUICKPREVIEW =off
HPDLGMODE=1
I started to select objects instead of internal points since it skips autocad serching whole drawing for boundaries.
Hope this helps.