I'm using Bizhawk 2.9.1 and since the game was only released in Europe, it's automatically set to be PAL (50hz). But then when I looked at the current WR, it seems faster.

So when I compare the score screen for the end of the jeep part ("stage clear"), I'm frame counting 8.317 s on my side and I'm counting 6.933 s on the WR video.

We can assume the runs should be done on NTSC (60hz)? If we are ok with that, we should update the rules so it's clear for everyone

I was unaware that you could run the game at 60 since it was a European only release. That's quite a difference and definitely raises concern. I'd like things to be on a fair playing field and I'm sure everyone else would too. I do run on a different emulator, Fusion. Maybe there are speed differences between them? I don't have much experience with Bizhawk, if it uses different cores like retroarch or has it's own stand alone.

I downloaded the lastest Kega Fusion (3.64) and run the game Jurassic Park (UE) [!].sms. the FPS showing at the bottom is at 60, so Kega Fusion default to NTSC. not sure if there are settings for that.

I've checked @AlphaNerd 's run, which is the only run on the real console and it's also 60 fps, the "stage clear" screen is 6.967s long

From SMS Power, there should be a brazil release, which is 60 fps. apparently PAL encoding with 60 fps. Since I cannot find a Brazil rom version, I'm assuming it was also intended for both 50 and 60?

https://www.smspower.org/Games/JurassicPark-SMS