Note - The Aspen web pages respond fast. Page refresh (which shows different content) is almost instant. Of course they are trivial, no db interaction.
The doc is accurate, but missing some key points.
1. Apache can use 2 different FastCGI modules. I think the SetHandler directive is different depending on which mod is used (fastcgi vs fcgid)
2. The name of the fcgi shell script file must be in the URL path.
This requirement is necessary when using the Files option (probably a way around it, but that requires more Apache research).
It is not required when using Apache's mod_rewrite (but I could not get the rewrite approach to work except with the index.html)
All other framework directions I've seen use rewrite. The Files method is cleaner to setup, but conceptually somewhat confusing.
There are some other points I might would make, but these were the key ones to me.
If you would like me to put together a more comprehensive doc, I would be glad to.