Maybe in raw CPU transactions, but it's not really a valid comparison. A Pi can't support sub-second response times for multiple users - I have one, I tried to see how many remote terminal sessions it could cope with. Realistically, it was one..... single, uno, ein.
Minicomputers weren't bought for their blazing top speed, they were bought to cope with the types of workload that came with having multiple remote sessions, big databases, and overnight batch runs, e.g. payroll.