It's incorrect what is wrote.

WebFlux you must use in Reactive mode with mono and flux as producer/consumer in multi thread on real CPU thread so you must use any external service in reactive so then try to compare performance it's impressive. So it have a big framework support developers community for solutions, problems and performance.

At now nobody can reach Spring Webflux Framework, I think that only go have similar performances.

It's a little tough because change programming style using producer/consumer in multi thread vision of framework but after 1 month you will see performance of apps impressive.

So I advice learn Spring Webflux Framework and don't use native to speedup startup application remove tons of libraries in springboot-webflux library that all add without think that searching beans and configuration lost a lot of time on startup application to do nothing because that objects in your Spring Application aren't used.