I built a theme on behalf of my business and made it available to the public after a while of tweaking it. Link is below:
I designed it to be a very performant theme, that even a Hugo beginner should be able to use. With features such as a customizable slogan, footer section, and an easy way to place social icons through the hugo.toml file (params.social list, using url, icon, and label values within each item).
It even has visitor switchable light/dark modes. The colors can be overridden by placing a custom.css file in assets/css. The selectors are :root and .dark. The variables are --bg-color, --bg-page, --bg-nav, --bg-nav-active, --bg-nav-hover, --fg-body, --fg-a, --fg-nav.
I guess for a sample site, you can visit my business site at gillulyit.com. Which most of the code is at github/gillulyit/website. When I tested it on pagespeed, it got all 100’s across the board, on shared hosting.
I think it might be safe to assume 90+'s are doable on most webhosts.