If you want to see an even faster "forum", see

http://forum.dlang.org/

That's impressive. What is their architecture?

> This website is a web frontend to the DigitalMars NNTP server and mailing lists. It is part of DFeed, which is also a D news aggregator and IRC bot.

> DFeed was written mostly by Vladimir Panteleev. Portions (including style and graphics) are Copyright © by Digital Mars. The source code is available under the GNU Affero General Public License on GitHub: https://github.com/CyberShadow/DFeed

Probably as static as possible, speed is easy then.