Are you running OpenBSD under a VM on your i7?

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If so, just build the packages on the faster i7 machine and:

\# cd /var/www/htdocs/
\# ln -s /usr/ports/packages/amd64/all packages
\# /etc/rc.d/httpd -f start

Then, on the slow machine, just point PKG_PATH to your http server:

\# export PKG_PATH=http://ip_of_i7_machine/packages/
\# pkg_add -v rxvt-unicode firefox whatever

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The example is for amd64.
Replace amd64 with the right architecture for you (e.g.: i386)