Re: Slightly silly
I know a little bit about the technical part of payroll with SAP. The payroll cycle business processes may have changed with $/4, I haven't worked on an $/4 payroll system as yet and cannot do a practical comparison.
In the past the payroll data model wasn't quite the best performing part of the system. Not having seen how they have changed it for the $/4 release, I would venture that they have replaced the clustered tables used in the payroll model with a new $/4 data model and also a columnstore technology (HANA).
Now that you can cache most, if not all the data in memory, throw a ridiculous amount of hardware and resources that you would never have done for a Unix/Windows system with a "normal" database and set it loose, I don't think it's all that it's quite surprising. You're essentially comparing a cheetah with a snail in hardware terms.
For example, SAP has redone the $/4 Financials tables with all new structures and the performance when the code takes advantage of the HANA architecture and the new structures is even more dramatic. It's a fair guess that it did the same with payroll.
Another point is that the code on one of the sites for payroll I worked on had a great deal of custom extensions (known as "enhancements" and "user exits" in SAP parlance) and they were horrid in terms of performance. That may also be the case here. So the improved payroll cycle is entirely believable. It just may not be completely true.
PS: $/4 isn't a typo. It's bloody expensive.