One thing that was immediately apparent upon switching VMs was that a lot of the existing overhead was in scheduling, context switching and the implementation of the actual library functions like `llDoWhatever()`.
We haven't even used Luau's JIT at all yet, but preemptive scheduling of what's typically trivial glue code is much cheaper and easier with a VM that supports it as a natural consequence of its design versus transforming everything into a state machine at the AST or bytecode level for a VM that doesn't.
> Actually, the biggest problem is that each idle program uses about 1us per frame, which adds up.
We haven't even used Luau's JIT at all yet, but preemptive scheduling of what's typically trivial glue code is much cheaper and easier with a VM that supports it as a natural consequence of its design versus transforming everything into a state machine at the AST or bytecode level for a VM that doesn't.
> Actually, the biggest problem is that each idle program uses about 1us per frame, which adds up.
More scheduler overhead to resolve :)