I don't think they were beating down RocketTheme in particular, they had a bunch of other templates in their chart. Well as this was brought up in these forums, I thought I would do a quick informal test using the Frontpage of Yootheme's template in question, "Beyond" and our latest "HiveMind" template. This is a test done from my home to the demo server of each. I don't know where yootheme's demo server is but ours is in St. Louis, Missouri, and I'm sitting in Golden, Colorado with a 8mb cable modem. I used Safari3's network inspector which provides a pretty good feel of how a modern browser interacts with a site.
YooTheme - Beyond
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This First image is the initial page load of their template.
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This image shows what the browser does when you 'go back' to the homepage. you notice all the images are cached, but because the css and the js files are now php (because of the gzipping), they are not cached, and must be re-downloaded on every page request. You can see how this affects the page load time.
RocketTheme - HiveMind
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As you can see HiveMind loads MUCH faster, the overall payload is less even though we have a header rotator that has 3 very large files. This could partly be due to our server, who knows, this is just a real-world example of two sites.
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Ah, look there, when going back to the homepage of HiveMind, safari only had to reload a single index.php file! All the js and css was cached. I rest my case