I've had a question about number of pages Joomla can handle compared to Drupral - I've been given a figure of 20,000 pages after which Joomla's performance is much slower than Drupal.
After a number of hours reseach I'm unable to find any info for or against.

Can any one point me in the right direction?

Overall caching and site performance on drupal is quite a bit better than Joomla Ian. If you're going to hit over 20,000 pages and funnel through more than 50,000 uniques a month I'd go down the Drupal path.

From what I've been told, get Varnish and another cache layer for Drupal and that will serve pages from cache and memory creating no load what so ever on the CPU. Just requires more ram which is cheap.

On the other hand, I'm up to 9987 k2 items on one of my sites and still kicking on strong but only about 300 uniques a day

I've done some more research and a lot of the info is poor as it referes to old versions (when it appears Drupal was much better).
Here is an article from the creator of K2 community.joomla.org/blogs/community/1127-gazzettagr.html - the site he talks about runs Joomla and K2 and has 5+ million visits a month.

Look at this www.pageranktoday.com/pagerank/joomla.org - shows Joomla.org has around 656,000 pages

So no study I can find to show one way or the other.

Cheers
Ian
yws.com.au