Vba Games Pokemon Silver I Am Playing Pokemon Emerald On VBA, And The Fast Foward Fuction Is Much Slower, Compared To Pokemon SGC. Why?

I am playing pokemon emerald on VBA, and the fast foward fuction is much slower, compared to pokemon SGC. Why? - vba games pokemon silver

For example, in the speed game Pokemon Silver Game 150% original, but is faster when presented as% 4000-6000. However, emeralds, rubies and sapphires is the speed like 250-260%. Is there anything I can do to speed it up?