Honest question about wallet encryption: Is the rounds determined by how fast one (1) core of the CPU is? or would having some mulitple core CPU, or multiple CPU hardware increase the rounds for encryption too?
having more cores only help with algorithms that could be run in parallel. for that, each round has to be independent of others. but here, AES is being used and the CBC mode makes it serial, meaning each block needs to use the previous encrypted block so you can't run it in parallel.
with that said AES algorithm is quite fast itself specially if the implementation uses the CPU intrinsics that exist in majority of CPUs (specially Intel) there is no need for parallelism even if it were possible.