darn it! you type slightly faster then i dopoecilotheria species grow very fast.L.parahybana as well.They grow like weeds.
This, in my experience also.Arboreal species -> Poecilotheria
Terrestrial -> Lasiodora
I don't know if these two mentioned species are the fastest among others, but, i keep both species and they are the fastest growing T's in my collection.