Hey Guys,i dont run the Game but i think this is one of the most experienced Communitys to ask this.

What Framecount Sites,App,Tools etc are you using? I am currently using the one from mattbraddock.com but it is sometimes 10ms off from other Framecounters,

Can you recommend me any other? :)

well, idk about this, but im pretty sure OG super mario bros would be a better place to ask this, as they have frame counted on like every single run for like 4 or 5 years, but i know more about smb than sm64, so take my opinion very lightly.

Aight,imma make a post there too just to be sure :D

Just use any editing software

Aviutl is the main one that gets recommended for retiming.

Avimeux also is a very good one.