Blazing fast blogs - an arbitrage opportunity?

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I recently setup a blog on Gatsby and got this firecracking perfect Lighthouse score (and its a PWA). SO here is what I am thinking.

Most blogs are slow and bloated wordpress sites let alone a PWA. Would simply converting them to a static fast Gatsby PWA lead to an immediate SEO bump? It seems to be an untapped arbitrage opportunity.

You can obviously start a blog and see the results but what if you just purchased an old established domain from flippa which is most probably on wordpress and simply ported it over?