> could it be that your ported code doesn't do things like it should be done in modern .net?

I'm actually curious myself after this discussion. I didn't port it, my coworker did it and I'd have to ask him. I did take part in the benchmark though and watched all the deadlocks happening.

Found this old screenshot of our internal FS driver debugging tool - to give you an idea of what I mean by needing high performance: https://postimg.cc/mc6YQFbC

24,654 filesystem events in C:\Windows\ in just 1 minute and 30 seconds on idle. 814 read operations (36,7MB) + 948 write operations (66,9MB). Now imagine this system-wide (not just the Windows dir) under heavier load. This is where modern .NET could not keep up leading to the aforementioned deadlocks.

Sorry that I can't provide more specific info at this time. I can find out more on Monday.