[chasil]

I readily admit that I am unfamiliar with POSIX_spawn() and its benefits over fork().

However, may I point out that Microsoft SQL Server benchmarks have been posted that show Linux TCP-H outperforming Windows?

https://www.dbbest.com/blog/running-sql-server-on-linux/

While I am sure that this is wise criticism, it might also be concluded that Windows itself contains no small amount of architectural decisions that limit performance.