One thing that irks me is why someone would use a mechanical drive at all, anymore, as a boot drive. Also, on the same drive, Linux ain't no speed demon either. This is 2018, not 2008.
Edit: Oh, and a 5400 rpm hard drive of any capacity is NOT moderately decent hardware.
Most average PC users running Windows use mechanical HDD's, I'd estimate that's a good 80% of users. So HDD aside, an i5 of literally any generation and at least 4GB of ram is moderately decent hardware and exactly what most are running.
So, once again, most Windows 10 PC's are slow as molasses, something that's not in any way an issue under Linux.