I've been using Jekyll for quite a while now, probably around 7-8 years. I'm not exactly a very active blogger, and I don't have any complaints about Jekyll in terms of generating documentation - usually there is no more than 100 pages. Yes, sometimes it can be quite slow, especially with complex Liquid constructions or if there are a lot of images, or if you're using the Kramdown parser instead of CommonMark. However, Jekyll's slowness is typically not critical, as sites are not built frequently, and one or two minutes don't really make a difference.
Recently, out of curiosity, I explored the range of popular static site generators (SSGs) - who knows, maybe there's something out there that's as stable and mature as Jekyll but with better performance. Hugo, Astro, and 11ty caught my attention. Since I'm not a fan of products that go down the path of excessive universality, like a Swiss Army knife with everything you need but with lots of drawbacks, Astro and 11ty were ruled out. That left "incredibly fast" Hugo, which I decided to try out and see if it lives up to its reputation as described in various articles. Hugo does indeed boast impressive performance thanks to its implementation in Go, and according to some, it has an "insanely awesome" templating engine based on the Go html/template package.