[functional_dev]

The article shows WASM being 1.2-3.7x slower, and your experience confirms it.

Do you have any idea which operations regress the most?

[anematode]

Based on looking at V8's JITed code, there seemed to be a lot of overhead with stack overflow checking, actually. The function prologues and epilogues were just as bloated in the tail-call case. I'll upload some screenshots if I can find them.