fork vs. posix_spawn (vfork)

[notna]

Hi D gurus.

Did read an interesting post form GitLab [1] how they improved 
performance by 30x by just going to go_v1.9... because they again 
went from "fork" to "posix_spawn"...

I've searched the GitHub DLANG org for "posix_spawn" and didn't 
find a hit... so asking myself and you.... is DLANG still on 
"fork" and could there be some performance improvement potential?

[1] 
https://about.gitlab.com/2018/01/23/how-a-fix-in-go-19-sped-up-our-gitaly-service-by-30x/