Function colouring is the real cost of async/await, and green threads like Go's avoid it — but for an existing runtime such as JavaScript or C#, async/await was still the right solution.

Danish software engineer and Microsoft technical fellow

So that's unfortunate, and that's why some environments like Go, for example, has has Go routines and green threads, which are really language emulated lightweight threads that kind of do what I'm talking about, but but at a much lower cost. But you avoid the function coloring. So there is a bunch of different things, but but you know, but for an environment that already exists like JavaScript or like C# and and the Windows event loop and and whatever, this this was the right solution.