Neither automatic bounds checking nor GC really add slowness. Any reasonably safe program will check the bounds explicitly, so there is no speed gained vs. guar

Neither automatic bounds checking nor GC really add slowness. Any reasonably safe program will check the bounds explicitly, so there is no speed gained vs. guaranteed bounds checking via the compiler. Actually any good compiler can remove most bounds checks, if it can proove that the access is in bounds. Also GC can be quite faster than manual dynamic memory management.