Specifically, I'm hoping to show that vanilla architectures can be not only performant, but easy to maintain with well designed code that uses stable and known patterns. Using JSX just so happens to clean up the code nicely and make the relationship between React and vanilla very visible, but that's really all it did here.
Although to be fair, the hack required to get JSX-as-DOM to work is really unfortunately and I'm not very happy with it, and I would prefer JSX to just render as an object tree that anyone can render however they want. But when I tried that for a few months or a year, it was not nearly as performant as rendering them as strings as soon as they're evaluated, which can then be cached via standard module caching. At least, that's how I got immaculatalibrary to entirely render all HTML files in ~700ms initially and ~70ms on most file changes.
I'll try to do some experimentation next week to see if I can get more performance back out of having <foo bar={qux}>child</foo> to render as {foo:{bar:qux, children:[child]}} again though, because that would absolutely be the ideal, and would unfork JSX in the same way Typed Annotations proposes to unfork JavaScript types.
