Little question.

In the sownload section, you can download source, install or upgrade package of DNN.

Upgrade - it's ok, only for upgrade.

But install and source  - both can be used for construction of new site.

I know, that you will always suggest to take install package for a new site, but what if I'll build my site from source package?

I already tested it, and it works. I downloaded the source package, extracted it to site's folder and ran install wizard. The site was installed ok.

I would like to know, if there's some performace problems that may occur with that kind of installation?

And, if I have already a  working site, made by this kind of installation, which is slow, and I don't know why - is it host or site package, - what can I do to optimize it?

To mention, I did not open the site in Visual Studio and did not build it. It's working but very slowly. When you open the first page, it loads about 30 seconds.

The navigation is slow too.

Do I have to open the site and rebuild it?

You never "build" a DNN site.  The Source version is only there in case you need to modify the source.  If you do not, the Install version is identical with fewer files.  As for your slowness, it has nothing to do with what you installed.  Some of it is due to the JIT compiling in ASP.NET, some of it is likely due to your configuration and/or content.

Take a look at:

http://www.mitchelsellers.com/blogs/articletype/articleview/articleid/283/how-i-get-my-dotnetnuke-sites-to-run-so-fast.aspx

Jeff

Thank you, I wil take a look at the configuration guides that you have mentioned.