We will never know. I think I was probably 16 at the time there. With a lot of hindsight and watching some videos lately about hacking the Mario 64 3D routines I wonder if the techniques we thought were fast back then are outdated now?

There are better profiling tools available now. I might be able to do it much better. Plus, not all registers are equal on the 486. Using FS and GS to hold data might be slower than pulling it from RAM. How much on chip cache does a 486 have? I don't know.