Conkers bad fur day seems to drop in frames on alot of pc's even mine it does slightly, its still playable though.
i play in 1280x1024 with aa/af 4x/8x.
and it runs at a playable rate on the below system
SSB also slows down depending on how much of the bg is shown. i've noticed that on the mini games it tends to be slower coz of the amount of stuff in the bg.