In 1-2 on my rom of smb3 when doing a run at the start you run up those 2 hills then you drop from the pipe that dispenses goombas and bounce off the goomba already there then you use that to boost up over the next pipe tower thingy however in all the emulators ive tried whenever i drop in an attempt to stomp the goomba I hit the ground too early and it just barely kills me is this the emulators fault or am I doing something wrong?

So the reccomended nes emulator for speedrun.com is fceux wich i use and i thought that all nes games ran at 60 fps but smb3 and a few other titles run at 50 i was wondering if this is something i should adress or if it really does run at 50 on regular nes runs