Kirby has NOTHING to do with any part of this code.
The original creator was "NoHack2Win" and then leaked/stolen by Ninarm1.

[Matrix Slowdown - NoHack2Win - NTSC-US]
2834XXXX YYYYZZZZ <- To Activate/Deactivate
042434DC 60000000
206C7101 00000000
CC000000 00000000
042434DC 83E1000C
E0000000 80008000
 
[Matrix Slowdown - NoHack2Win - PAL]
2834XXXX YYYYZZZZ <- To Activate/Deactivate
04244398 60000000
206C7101 00000000
CC000000 00000000
04244398 83E1000C
E0000000 80008000
 
[Matrix Slowdown - NoHack2Win - NTSC-JP]
2834XXXX YYYYZZZZ <- To Activate/Deactivate
042442B8 60000000
206C7101 00000000
CC000000 00000000
042442B8 83E1000C
E0000000 80008000