B4J Question B4A->B4J use multi-core processor ?

Which code? It doesn't matter where the code comes from. Which problem are you trying to solve?

I'm interested in for the future whether I like it obviously to think about optimizing the code when porting from B4A to B4J for optimal performance on multicore processors ? For example, in such tasks as multiple network streams with encryption and archiving

AsyncStreams in both B4A and B4J uses background threads for the network related tasks.