Code with lots of small short-lived objects is often by default faster in something like rust, because stack allocation is very efficient (even compared to the

Code with lots of small short-lived objects is often by default faster in something like rust, because stack allocation is very efficient (even compared to the bump allocation in a generational GC, which is much more efficient than heap allocation but worse than stack). If you have a lot of objects which can exist on the stack in your program, java will tend to do poorly in comparison. (and in general java will trade off memory for speed: modern GCs can be very efficient in execution time but will use 2x-3x as much memory in return. If you want low memory usage your code is going to run slower).