Oh, I was about to optimize that program by using parallel_map to spawn one fiber per thread. Luckily I searched the forums because it seems I already did that: 1.0 multi-threading memory use issues - #15 by asterite
Multithreading support exists in the runtime. What’s lacking is standard library support like Go’s work group, maybe parallel map, etc. But those are relatively easy compared to implementing the runtime to support multithreading. But, those things can also come in shards, similar to how to achieve parallelism in Rust you use Rayon. I’m not saying that’s ideal, but it’s definitely possible.