Cool. I watched it twice! I thought you meant the stack switching done by wasmtime, which is not "a handful of cycles," but I stand corrected: It's fiber/coro switching. Alfred, a friend of mine, gave a talk on using those on a bare metal unikernel we were creating back in the day! :)
Yeah it’s just the stack switching itself that is a handful of cycles, but there is not much more overhead for the full VM switch if you structure your embedding the right way. Code the code is source available if you want to peek at it!
