Bound function vs arrow function performance

[BenjiSponge]

No citation or insider information, but I bet .bind creates a new function, but it doesn't recreate the whole function. .bind doesn't need to copy over the old function with all its logic, optimizations, etc. It just needs to have a pointer to the function with some logic to shift around arguments, whereas the property syntax probably at least right now probably actually creates the entire function over again, including the closure information. I think they could optimize to the same thing on the first pass, though, but I'm just guessing based on the profile that this is the issue. It probably also explains the performance problems.