poked around your codebase a little... I had no idea forEach was so slow!
Anywho, run this:
while true; do curl http://try.nodebb.org/bench/forloop; done &
3 times or so from bash and goodbye try.nodebb.org.
also write more unit tests!
also since I pointed this out, could I put a feature request in for a classic theme? something that looks like vBulletin or so with similar formatting/pagination and whatnot.
also eliminate the tab character from your codebase. jesus.