It did improved a lot, but unfortunately not near zero enough.
It is managable if you avoid js wasm round trips, but if you assume the cost is near zero you will be in for a unpleasant surprise.
When I have to do a lot of different calls into my wasm blob, I am way way faster batching them. Meaning making one cal into wasm, that then gets all the data I want and returns it.
https://hacks.mozilla.org/2018/10/calls-between-javascript-a...