I'm new to WordPress but not to programming. (2 part question)
(1) I have used DotNetNuke for 2 websites and I was very disappointed with the speed. The problem is that it is not only memory intensive, but being asp.net it has to recompile whenever the site is idle for more than 20 minutes -- which can take up to 30 sec to a minute depending on the performance of the server, amount of memory, size of website and bandwidth. But as long as there is someone on hitting the site before the 20 minute idle time is up it's pretty fast since the pages are cached.
My question is does WordPress, being a CMS, also have the shortcoming of being slow?
(2) DotNetNuke can have several websites (multiple portals) in the same installation on the same account (shared server). Does WordPress have this ability?