Custom navigation: sorting and hiding certain pages / communities

We have constantly struggled with our navigation in the portal. Our current setup is to not display anything where name begins with 'Hide - ', so if a community has 10 pages but only 3 should show up in the navigation, 7 of the pages need to be named "Hide - ..." This obviously has some disadvantages as the word Hide - is visible some places. Another issue is the differentiation between a 'page' and a 'community' to end users. Our portal looks like a website users have no idea what the difference is. To them, everything is just a page. Currently we group and style pages and communities different, like so:
parentcomm
--subpage1
--subpage2
--subcomm1
--subcomm2
I'm trying to come up with some ways to improve the navigation. One idea would be to set a custom property isHiddenFromNav that would be read presumably in a custom tag. This is currently the way that the sorting of communities works, a sortorder property is filled in. I'm curious about the performance of reading custom properties, however. Is it faster to use the database api or the search api? How can i ensure these values are cached?
As far as improving the usability, i'm exploring mixing pages and communities, so a community just looks like a page (but with a plus or an arrow to indicate there is more stuff there).

In our customization we are using 4 custom property's for portlets. Moreover, we are not basing on portal cache, we have implemented static hash table's where each property is stored. PEI is taking care about the refreshing properties in hash tables on current portal instance (NewEditObjectActions.xml), there is also code responsible for sync new value with other portal servers.
As portal server we are using WAS 6.0 (4 machines, 8 jvm on each server). WAS has nice feature DRS (Data Replication Service, easy to use, operate with one jndi name) which propagate new value over all claster members .
Bellow you can find some informations about our performance test.
Home page contain usually ~10 portlets
Scenario details:
- Virtual users: 1500
- Ramp up: 3 virtual users logging in every 2 seconds
- Think time: 5 sec
- Top load duration: 45 minutes
- Virtual user’s browser flow:
Login (1 time)
Home Page (100%)
Perform some operation in 2 portlets (search, go to archive, back, search)
Change language (5%)
Logoff (just 1 time, at the end of the test)
Results: average time response less than 3s, ~250 pages/s.
I hope this will be helpful for you.

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