How to optimize/structure a website with 100+ static pages?

I wanted to design a content based website where each content has its own UI uniquely designed. For normal content based sites, the image location and text is stored in the CMS and loaded into a generic layout. But in this case, we are going with individual layouts and UX for each content. Every content is a uniquely designed static page. In such a case after a point once the content crosses 100+ pages, the website will become too heavy. Sticking to dynamic pages isnt a solution because they concept revolves around: Content Uniquely Crafted. How to approach such a problem?

Most websites with unique UI that I've seen as of now are product based websites like Apple where they uniquely design the webpage for each of their products. That is at max 6-7 pages and wont cause the website to become very heavy. But in this case, I am looking for an option to scale this because with more content there will be webpages added to the site and it will cause the site to be very heavy and slow.