No, you can easily measure this stuff with "time". It was 75ms vs 3ms for python vs go... this is for some custom prompt he wrote, so this is the time it takes

No, you can easily measure this stuff with "time". It was 75ms vs 3ms for python vs go... this is for some custom prompt he wrote, so this is the time it takes to get the new prompt every time he was pressing return. I don't think it's that big a deal, if it was navigation keys in a text editor then it's a big deal, but when you hit return you are usually executing something much longer than ~50ms anyway so it's not an overhead that's going to multiply that much.