Having a look today on Nimbb'ss traffic stats at Alexa, I noticed that it now displays the Load Time of the site. Here is what Alexa has to say:

So nimbb.com is in the top 4% fastest sites of the Internet. Quite a nice accomplishment! It takes an average of 0.376 seconds to load a page on the site. In comparison, the twitter.com site takes 1.709 seconds (60% of sites are faster).
How do we achieve that? We use a simple site design, have extensive use of caching and coded incredibly fast database queries.