well back before my luck crapped out on me, brazilian pennywort and sunset hygro were tied for the fastest in the tank. It got to the point where i was actually almost getting annoyed by them.
the slowest....probably java fern and my micro babies tears.
the most annoying is that bladderwort stuff. Havent keyed it out for species yet but good lord it out grows the bits of algae in the tank its almost bad enough for me to do a reset and carefully try to eliminate it from the tank. Its the fresh water version of aptasia anemones, once you got it its there.