How many DADs are too many?

I've read on mod_plsql performance tuning pages that fewer is better but how much of a hit does another DAD really cause? I'm wondering if we could stop running multiple applications under a DAD and break them up by application. Say we went from 6 to 20 as an example.

Each DAD requires Apache to set up a handler struct for the DAD - and if the DADs are configured with connection pools, additional memory for these are also needed.
So in that respect a DAD is no different than a mod_perl location handler, or a mod_php location handler, and so on. Same basic Apache configuration, performance and scalability rules apply.
That said, I have 37 DADs on a production Apache server (web front-end to several RACs, and SE and EE databases). The little web server is a dual core AMD Sunfire server. And not showing any strain providing 100's of users access to a large number of Apex applications.

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