To determine the memory usage I am just using task manager and by having a separate named app pool for each web site I can see how each site is performing.

I accept this will not give a fully accurate picture but gives a comparative reference to each site.
I had recycled the app pool but to make further certain I have restarted the web server and then gone through several pages.

The site is now 158MB which is lower than yesterday but this was after just 5 minutes of site surfing including admin and host pages.

My impression it is definitely using about 50MB more than previous versions but this is a rather crude test and I appreciate this is on a new version that could be further optimised.
You talk about loading the VB.NEt libraries and C# libraries potentially cause the extra mem load, as most of the third party modules are I assume written in VB.Net won't this mean that we will always have a bigger footprint.

FYI - This is what is loaded in the site and it is a 64 bit Win 2008 Version

Module Version Instances
Active Forums 4.1.7 1
Active Forums What's New 1.0.0 0
Configuration Manager 01.00.00 1
Console 01.00.00 2
DDR Menu 01.99.05 0
Documents 05.00.00 1
FAQs 04.05.01 1
Feed Explorer 01.00.00 0
File Manager 2
Form and List 05.01.03 3
Form Master 2008 2.0.4 2
Google Adsense 1.0.1 1
Google Analytics 01.00.00 1
HTML 06.00.00 13
Languages 01.00.00 1
Log Viewer 1
Newsletters 1
Pages 1
Recycle Bin 1
Repository Dashboard 3.1.15 0
Search Input 01.00.00 0
Search Results 01.00.00 1
Site Log 1
Site Wizard 1
Sitemap 01.00.00 1
Skins 01.00.00 1
Solutions 01.00.00 1
Survey 04.70.00 1
Taxonomy Manager 06.00.00 1
Users And Roles 3
UsersOnline 3.1.0 1
ViewProfile 01.00.00 2

Any module you add to the app has the potential to increase the memory used. 

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Chris Paterra

Get direct answers to your questions in the Community Exchange.

We all recognise that adding more modules will potentially increase the footprint.

The issue in question here is how does DNN6 compare with DNN5.

What we have here is a great product that provides a fantastic web application framework that we all use and enjoy.

The thread here is to be constructive.

The points are :-

1. Establish if the memory footprint has increased from DNN5.
2. If it has, is the footprint too large
3. If it is too large is this something which should be addressed.

These are unanswered questions and I would appreciate feedback from other users