> coordinated groups of Wasm envs too much overhead. The way that zap gets so fast as in the video is by decreasing overhead, minimizing coordination, and by

> coordinated groups of Wasm envs too much overhead. The way that zap gets so fast as in the video is by decreasing overhead, minimizing coordination, and by allocating on the stack instead of the heap for all allocations related to context switching. One could imagine a BEAM system where you create a custom allocator where FIRST you get allocations on the stack for the first X register refs, then later it reaches out to the heap. This would be blazingly fast for the 99% use case in elixir. You're also generally going to have a hard time figuring out how to do this in rust, as I don't think it's so easy to mix stack and heap allocations into a single interface for rust.