They can, and these are already multi core operations. If takes 4 cores 100ms to do this operation, so on a server with 4 cores doing a 100 of them takes 10 sec

They can, and these are already multi core operations. If takes 4 cores 100ms to do this operation, so on a server with 4 cores doing a 100 of them takes 10 seconds, while on lambda it takes only 0.1 seconds to to them all in parallel.