With CGI, you do your own data persistence. It leads to gigantic blobs. Also, you spawn a process for each request.

http://stackoverflow.com/questions/424839/what-were-the-main...

As I see it, it's the old low-level vs high-level discussion all over again. I'm sure you have seen it before.

Low-level programmers argue that they have control and know how everything is working. High-level programmers argue security, problem isolation, modularity (i.e. not only using your own code!), readability, maintainability.

I assume he's implying that CGI is slow.