It's Synthesis and yes you could expect the same. ;) Some of it is caching plugins, but Synthesis uses Nginx as well, which is pretty freakin' fast out of the box.
For example, I host my own sites on an Nginx server (not synthesis - we have our own self managed dedicated box) and you can visit then in my sig below, just to check speeds. And we don;t even cache.
These forums were CLOSED to new posts on November 19th, 2012. New forums are here: http://www.studiopress.com/forums/
and you will need to SIGN UP AGAIN.
If you need assitance with setting up your theme, go to http://my.studiopress.com/
and read the SETUP links or the TUTORIALS link on the side tab.
If you need Account Assistance
, file a help desk ticket at the same location.