You're right about Solid, of course, I forgot about its compiler doing magic!

  $("div", ":my name is", () => name)

Close.. but $() doesn't act an return values of function arguments. You'd need to do:

  $("div:my name is", () => $(":"+name.value))

Or:

  $("div:my name is", {text: name})

Or, if indeed you don't care about recreating the <div> (which would normally be the case):

  $(`div:my name is ${name.value}`)

Re performance: Aberdeen is already pretty well optimized, so I don't think a lot more could be squeezed out. Aberdeen performs pretty well on js-framework-benchmark, but not spectacular. There's a certain amount of overhead involved in having many fine-grained observers and fine-grained observable. What you gain from that, is a lot more flexibility in where state can live, and not having to worry about things like memoization.

Where Aberdeen does really shine, performance wise, is reactively displaying lists ordered by some specific function. Other frameworks generally require a sort() and complete list VDOM redraw for each little change, while Aberdeen can just redraw a single row (using a skiplist to determine its (new) position in O(log n)).