When I tried 3.9 with my 030 and 8 MB of fast ram, it was hogging resources to the point of being unusable. I suppose with the right amount of tuning it would be better, but I ended up going with classic workbench.
http://classicwb.abime.net/classicweb/advsp.htmI wish that an official version of 3.9x existed that included everything that classicwb has, including all the updates and optimizations to make it useful out of the box.