If you statically export you won't even notice, and when navigating it will actually be a lot faster when only the content is replaced..

Have you checked this is the reason? not slow network? and not ads/analytics and blocking assets? That's not exclusive to frameworks btw, and probably less likely as most optimize these things for you.

The website that is linked originally has a bunch of blocking assets.. lighthouse score is not amazing either.

Just like the original article, you might want to test your assumptions a bit more.