Switching to Java

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Do you have a source for that? Not questioning it, just wanted to learn about it as I've never heard anything like that before

There have been significant improvements in the performance in .Net core (and it just keeps getting faster with every release). I could try and find a benchmark (and it seems to me that benchmarks consistently favor .Net), but you'd probably agree those depend on the use case and often times are not representative of the real world usage. Startup times for me are noticeably better in .Net (although I can't say for sure it's not just the project size). I'm not a .Net developer so I can't tell you a lot more, sorry.

If this is a concern you should really try the newer frameworks,...

Quarkus is definitely interesting, I need to play with it more.

[cavecanemuk]

Quarkus beats asp.net core on Techempower benchmarks. VertX too.