GatsbyJS
Until now I'd been generating my blog with Jekyll, but I tried migrating it to GatsbyJS.
With GatsbyJS you can generate a React.js-based static PWA site.
It bills itself as a Blazing-fast static site generator, and true to that, page transitions became blazing fast, so I'm happy with it.
I'm still hosting it on GitHub Pages as before, but at some point GitHub Pages started supporting HTTPS for custom domains, so I migrated from the Cloudflare SSL certificate I'd been using to the one provided by GitHub Pages.