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It seems like both Mithril and Imba do some form of DOM diffing. It’s easy because you just tell it to update the DOM using the latest state. Imba in particular says it has a really fast way to do that. But isn’t it that case that no matter how fast they can make it, it is still doing way more work than an approach that can determine what parts of the DOM need to be updated without DOM diffing?

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Mithril uses a vdom so yes it's doing diffing. It's certainly slower than Svelte but it's still plenty fast for most use cases.

https://krausest.github.io/js-framework-benchmark/current.ht...

Most importantly Mithril is very lightweight. Check the startup metrics on those benchmarks. This is not a totally fair comparison since Mithril includes a router and an http client and the others do not. Still, it manages to be among the best.

Imba uses memoization and, much like Svelte, direct DOM manipulation.

https://www.imba.io/guides/advanced/performance

Imba was used to build Scrimba (an online code tutorial/editor) which is very impressive.

https://scrimba.com/

I couldn't get past the Ruby-esque syntax, but it is a very impressive effort.

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