Page load speed is exceptionally slow

Site: pillarsofsteel.org

Theme: WPMU NELO

Notable plugins: W3totalcache, BBpress, Sendpress

The site was a little on the slow site when I initially created it 3 weeks ago, but now it is incredibly slow. I've disabled plugins, added caching plugins, moved the site to a better server environment, but nothing helps. In fact, it is considerable slower than before... to the point that it is unusable.

Please look into this and advise.

Mike July