@nine_k shared this https://programming-language-benchmarks.vercel.app/wasm-vs-r... in the comment tree. The results are pretty bad. You could lose 2x or more in cpu perf. There're cases where wasm is pretty close to native though.
when I mention performance, they kinda waffle a bit, saying "CPU is cheap" or something similar, and they start to show a hint of understanding when I say that cloud resources are billed by unit of CPU time, and by amount of RAM used. then I say that our mutual employer invokes lambdas hundreds of trillions of times per year and I think they briefly understand before being caught up in "new stuff is awesome" technology fetishism again.
it's exhausting.
everyone should live overseas for a couple years because it changes how you view the world... everyone should be a game developer for a couple years as well, because you will quickly notice just how unbelievably slow modern software is. more people need to see that.
security is important! portability is important! other things are important, always, and when you gain a sense of just how slow software is today in comparison to how unbelievably fast modern hardware is, it becomes very hard for me to think positively of anything that lowers performance further for almost any reason.