Looking at the board there is only one USA runner that has a time about 40 minutes slower than most JP runners. Outside of turbo controller being used, is this because the quality of play maybe better on the JP board, or are there any regional exclusive tricks or glitches that make JP runs faster than the US/EUR version?

There's an infinite money glitch used in the JP version so you can buy rare weapons super early in the game. Also quality of play is a big factor, just compare the glitchless WR to the JP any% WR.

*The glitch used in JP any% is only available in JP game, was patched in EUR and US