[shouldbworking]

Not a ton of places, but in my case forwarding HTTP requests. Netty is close to 100x faster than regular .NET. Another example is JSON serialization. Jackson/GSON are maybe 30x faster than the built-in JSON handling in C#. Everyone smart uses Newtonsoft now, but it was a huge bottleneck until a few years ago.

.NET seems to have a lot of rough edges where MS said "fuck it, nobody will complain if this is slow". If you happen to use one of those features that didn't get enough love you get burned. Java is generally polished throughout, most likely due to the sheer volume of software written for the JVM