I recommend you to use Nim
because socket server must use FFI and might use syscall and assembly
I heard that Crystal has own style pointer so you have to convert Crystal style
pointer to C style pointer
it will very uncomfortable
and you can't remove GC
Crystal use boehm GC
but Nim has many memory system(none, ARC, ORC, refc(GC), Boehm(C style GC),
Go(Go style GC), etc...)
the best thing of nim is you can choose no memory management buy choosing none