Codes

Double Gameplay Speed
First, go the Start button, and choose Run. Now, enter "C:\Program Files\KONAMI\Yu-Gi-Oh! Power of Chaos JOEY THE PASSION\joey_pc.exe" -speedy
It must be typed exact, or it won't work. After the game kicks in, challenge Joey to a duel, and you'll definately see a difference...
Show current game speed
First, go the Start button, and choose Run. Now, enter "C:\Program Files\KONAMI\Yu-Gi-Oh! Power of Chaos JOEY THE PASSION\joey_pc.exe" -fps
It must be typed exact, or it won't work. After the game kicks in, challenge Joey to a duel, and you'll definately see FPS tracker appears in upper-left corner (30 normally, 60 with -speedy mode on).

Cheater