.NET started to barely surpass JVM with .NET Core 2, of course this is just a general tendency, actual performance depends greatly on the problem domain, how cleverly program, what counts as "java" and "c#" and so on.
To the point. Doing it right has a much higher influence than the platform. The later might be a barrier but at that stage, that often does not matter anymore. Even PHP utilized the right way (looking at swoole) can performance wise beat other stacks.
Disclaimer: I do not generally encourage the usage of PHP :)
Disclaimer: I do not generally encourage the usage of PHP :)