Re: Mainframes ARE slow.
"I/O of a mainframe is superior" that is a myth that was true in the 80'ies and 90'ies then the best you could get was a Intel 286 or 386 machine.
Nothing magic about I/O. I/O is just Input and Output of bits and bytes. There are different kinds of I/O, there is disk I/O, there is network I/O, there is memory I/O, there is ASCII terminal I/O, there is bus I/O.
What kind of I/O is the mainframe superior on I may ask. And where is the open and public benchmarks to prove it.