By not using jsx? It would be an order of magnitude less waste to just set innerhtml in such a case, than to waste your users' cpu cycles diffing and reconstituting a giant tree of vdom.
I'd also generalise the question beyond jsx to just 'inline with javascript' - ie just as you say, inject the svg markup into the DOM synchronously using the same javascript that renders the DOM (rather than some deferred source) - it's just most of the time for me that means jsx.
