Windows NT on 600MHz machine opens apps instantly. What happened?

They're loading the toy applications that came with Windows 3.51 an operating system developed when 486's were common and first generation Pentiums were the bleeding edge, so around 100 MHz. (Also, using clock speed alone discounts any generational bumps in efficiency.) Of course it will be fast.

The same apps were opened on his modern machine for comparison. Are windows explorer, notepad and command prompt toy apps?