I use hugo theme (even) - https://themes.gohugo.io/hugo-theme-even/ https://themes.gohugo.io/hugo-theme-even/ which seems pretty decent in terms of performance.

I use hugo theme (even) - https://themes.gohugo.io/hugo-theme-even/ https://themes.gohugo.io/hugo-theme-even/ which seems pretty decent in terms of performance. There's some heavy loading of fonts and js, but it still comes down below 1Mb. Maybe you can derive some inspiration from it.