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Forum Moderators: rogerd
I know there is forum caching problem if there are such many number of forums if I use vbulletin.
As it seems load all the forum into the forumcache on each page. With 4000 forums that would be an immense amount of data.
Is there any forum software suitable for me?
One approach might be to break it into a number of installations (e.g., by region). I'd spend some time hunting around big-boards.com and see if anyone else has the kind of activity and forum complexity you are designing for.