TL;DR: CrystalMark Retro 2.0, a free benchmarking tool from Crystal Dew World, now supports Windows 95, 98, and Me, after a year of development. It allows users to compare retro and modern systems.
Found out not too long ago that my dad still has our old IBM PS/1 in his attic. I have no idea if it still works since it's apparently been up there for at least 10 years. 25MHz 486 with Overdrive ...