What is the slowest console to run this game on?

For Spyro 1:

PS2 w/ Fast Disc Speed (Fastest) PSTV Emulator* PS1 (Slowest)

*Only certain emulators are slightly faster than PS1. ePSXe has the least load times, but is the most inaccurate, and has the most input lag. Duckstation is slightly faster than PS1, is accurate enough for Spyro 1, and has the least input lag Mednafen has equal loads to ps1, is the most accurate ps1 emulator, and has ~similar input lag to Duckstation (~1 frame)

If you plan on running on emulator, I recommend Mednafen or Duckstation, due to ePSXe being quite inaccurate in comparison now-a-days.

Its gotta be that one model of PS1 with the power unit too close to the láser reader so that it gradually gets worse the longer it's turned on

PS3 is the slowest console, Xebra is the slowest emu. (I love how these are so slow and bad to run on that they are just forgotten almost.)

PS3 is slowest, I was always last out the gate racing alongside PS1 and emulators (and not just because I was bad)