That is speedy, 2.2 seconds on a 9.54 MHz Tandy 1000RL!

The ~4 seconds to boot up to a GUI desktop is actually even more impressive: https://youtu.be/JIEPqD4luG8?si=9gVtFCIxFYma1erC&t=556

My top of the line i9-9880H Macbook Pro from 2019, with PCIe 4.0 NVMe speeds, needs over 20 seconds to boot up in comparison...

I had a Tandy 1000 TL/2; it had a tandy specific MS-DOS 3.3 with Deskmate setup in ROM, booted pretty darn fast; but you had to give that up if you wanted to boot a newer dos. A newer MS-DOS still booted quick, and there wasn't much to the BIOS before it hit the drives, but you couldn't run Deskmate on standard MS-DOS.

I realize at the time it wasn't very easy for most people but a computer that often receives upgrades via ROM is the Atari ST. I (sort of) recently upgraded my 1040. I bet one could produce DOS 6.22 replacement ROMs for the Tandy!