goroutines vs vibe.d tasks

[rsw0x via Digitalmars-d-learn]

On Tuesday, 30 June 2015 at 15:18:36 UTC, Jack Applegame wrote:
> Just creating a bunch (10k) of sleeping (for 100 msecs) 
> goroutines/tasks.
>
> Compilers
> go:     go version go1.4.2 linux/amd64
> vibe.d: DMD64 D Compiler v2.067.1 linux/amd64, vibe.d 0.7.23
>
> Code
> go:     http://pastebin.com/2zBnGBpt
> vibe.d: http://pastebin.com/JkpwSe47
>
> go version build with     "go build test.go"
> vibe.d version built with "dub build --build=release test.d"
>
> Results on my machine:
>
> go:     168.736462ms (overhead ~ 68ms)
> vibe.d: 1944ms       (overhead ~ 1844ms)
>
> Why creating of vibe.d tasks is so slow (more then 10 times)???

how do they compare if you replace the sleep with yield?