The speed difference is very visible, no matter what content you try, but of course it is subjective. Most pages served from OACS take between 100 and 700 ms. When I turn on developer support, I may see half that time are spent in posgresql queries.
Maybe I expected too much from OACS. I used to program in tcl for the last 7 years, and that took me on the way to OACS. But python is not unfriendly too. (the only thing I really hate is Java!)
Well, for the project I have in mind, Apache+mod_rivet will do, both in speed and development time, so please don't bother with my previous comments.
Thanks for your prompt answers, I really apreciate!