Thanks apeisa, great comments. For now I have linked the "DESIGN PORTFOLIO" text to the first portfolio item, but I will talk to the agency team about it. Perhaps a hover color or other effect would make it more clear.
As far as the hosting goes, that's really interesting. The agency site is on a Dreamhost VPS, and the Yarn Haven site is on a Knownhost VPS in Dallas. Could you tell me if you have similar issues with my personal website? It's on yet another VPS with Site5 and I'd be interested to know if there's a perceived difference. It doesn't run PW, but it is cached, though perhaps it wouldn't make a big difference in initial download speeds.
I have heard people say they thought Knownhost VPSes have an I/O bottleneck issue somewhere, and the Site5 VPS seems much more responsive, but it's also closer to me (California, my home, vs. Texas).