Some features that Windows did better than Linux/Unix:

* IOCP is loads better than epoll

* SEH is a better model for synchronous processor instructions than Unix signals

* Windows allows some better/easier ways to introspect or modify other processes than Linux does. You can't change another processes memory map on Linux, whereas you can on Windows. And /proc is a pretty poor interface for getting process data, IMHO.

I/O completion ports was always my go to answer for this but perhaps recent async improvements have helped close that gap?

[see also https://news.ycombinator.com/item?id=11865760 for a lively discussion on this topic]