Also, HN is fast. Well, this might be a sole implication of its simpleness: I need fewer steps to accomplish things, and the pages load faster because there's

Also, HN is fast. Well, this might be a sole implication of its simpleness: I need fewer steps to accomplish things, and the pages load faster because there's less stuff to transfer and less stuff for the browser to render. However, it might also be the case that the HN folks performed better optimizations than Reddit, or that HN needs less optimization because it has fewer visitors.