Author of sauron here, Yes sauron[0] is very much elm-like than any of the other rust framework, and it's very fast. How fast? Fast enough to be used in a text-editor[1] at ~15ms typing latency. It also suited application that has recurring events such as animation[2]
It also supports server-side rendering, and is used in one of my other opensource project svgbob[3]
[0]: https://github.com/ivanceras/sauron
[1]: https://ivanceras.github.io/ultron/