Super Mario 64 Speedrun on PAL console?

I'm a big fan of Speedrunning in Mario 64. I played it on Project64 before and then decided to buy a Nintendo 64.

I have now bought an N64 and also Super Mario 64, the N64 is a European N64. And the game is also European, now my question is: do I have any major disadvantages with a European N64 than a Japanese one or one from the USA?

Or is almost everything the same?

PAL is slower than NTSC because PAL only runs at 50hz and NTSC at 60hz.

Many say the game itself runs 20% slower? Is it really like that? I have now ordered everything and am afraid that it will not be as I imagined.

super mario 64 speedrun pls