I found a reference game ( https://benchmarksgame-team.pages.debian.net/benchmarksgame/fastest/csharp.html ) is a very good benchmark. Benchmark deliberate, covering the classic single-threaded to multi-threaded computing IO data processing. Clearly, in this game benchmarks, such as the field of network performance it is not easy to test. Organizers are tough but fair, rule makes sense. These benchmarks can indeed solve most practical problems than I've ever seen.
The overall impression is that much better than the 2.2 .Net Core performance of Java 12.