> if you need hard logic, you can use reactive for that

What do you mean by that? Any logic still has to execute in the same 16ms budget. In any case, it's pointless to discuss in a vacuum, I suggest you implement something like the JS Framework Benchmark [1] or DBMonster to see where it stands in fact, and then optimize from there.

[1] https://rawgit.com/krausest/js-framework-benchmark/master/we...