Most definitively, given the number of images they use. Dri.es is a unique case, coz you do not use almost any image or script and the home page is super minimalistic. The such experiment should use the same site in all systems. Iike exporting dri.es as plain HTML and hosting in an equivalent server/CDN.

Would be nice to check the server requirements to run cms+caching vs an HTTP server like Nginx to achieve the same results.

All this will address only the argued performance gains from STG, not the workflow.