I’m basing it on my limited experience of rewriting things from optimized but messy C++/D to JVM. Yes, the end result is much simpler but is memory hungry and i

I’m basing it on my limited experience of rewriting things from optimized but messy C++/D to JVM. Yes, the end result is much simpler but is memory hungry and is ~2x slower (after optimizations and tuning). Sometimes you can fit Java in less then ~2x of original footprint but at the cost of burning CPU on frequent GC cycles. Not every application is the same but the moment it involves manipulating a lot of data in Java you fight the platform to get back the control you require for those things. And by the end of day there is a limit at which reasonable people stop and just give up dodging memory allocations, creatively reusing objects, wrangling off-heap memory without the help of type system.