Does stdlib network sockets use only first thread?

[Pedro]

Thanks for detailed reply and pointing the right place in the documentation.
I don’t know why I didn’t notice that.

I also learnt just yesterday that event loop runs only on thread 1 in another topic Non-blocking network IO - #9 by Pedro via great JuliaCon talk A retrospect on Julia web services: HTTP, performance and memory | Guliński, Georgakopoulos.