Most of the cache-related optimizations available in C++/Rust can be done as well in fast managed environments. I agree that sometimes they make it much harder than it should be, but it is often still easier to fight with a managed runtime for the 5% of performance critical code, than to fight with manual memory management of an unmanaged environment for the 95% of non-performance-critical code. If you see a 50x performance disadvantage of some program in a managed environment like JVM or .NET, it is a fault of a programmer, not the runtime nor tools.