compiling ports to packages on fast system, installing on slower one

[Dave]

Hello,
    I was wondering if this was possible? I've got a box that i'd like to 
install the latest gnome 2.14 desktop on, as well as some very intense apps 
to build. I would like to compile the needed apps on my fastest machine as 
packages, then transfer all the packages to the slower box, and do a pkg_add 
* and they're all installed. My catch is i don't want to install everything 
on my fastest box to pull this off. I am using portupgrade and was wondering 
if this was doable?
Thanks.
Dave.