This is one of the cases where it seems more justified than usual. This is not a website intended for end users, maximizing for performance and conversion rate. It's a design showcase by a typographer, for typographers. Every pixel is crucial, and the intended audience would rather wait a few seconds to be able to scrutinize the output with the required detail.

I was so confused by there was no link to see the layouts. Turns out they were loading! It took like 3mins> on my network to even show the first one!