The issue happens on specific workloads (databases, hadoop etc) and (this is often not mentioned) after the system is running uninterrupted for a quite of while. The slow down comes due that the workloads mentioned cause memory to be fragmented and when kernel tries to defragment the memory (unsuccessfully) on each allocation.

Since the workload you mentioned looks like it is for a workstation that won't be running a database 24/7 over months/years, you are very unlikely to run into it.