Smooth huh?... Ok, lets go to my findings. When emulating 50mhz, the game ran at 49fps. Kinda slow to me...so I decided to try the default 25mhz, but it was WAAAY slower (even if it ran at 60fps). So I decided to start lowering the mhz little by litte from 50.
I tried 45mhz, the game ran smooth and nice, but it was running at 54fps (average)... I tried with 35mhz the game ran at 60fps, except for heavy-parts that ran at 55fps. Then, I went for 33mhz, the game ran fast, at exact 60fps, no slowdowns, no slow-like feeling.
Again, the card FSAA and FSAS samplings didnt made any difference. I suppose that the resolution wouldnt affect it anyways.
I'll be doing VF3 next, and if everything is ok I'll be trying Lost World too (but that later :P).