Originally Posted by
jakeelala
I've tested this many times over the last few years for throwing specifically. My test results almost unanimously showing this to do either nothing, 1-2%, or actually SLOWING the overall throw rate down, at end game when combined with other common sources of throwing speed (Rapid Shot, Quick Draw, Blinding SPeed, Tensers, 25+ BaB, Whirling Wrists, etc).
Recently however, since I stopped playing, someone has suggested that it now is working more like intended and increasing speed. However, I still believe the combination of speed boosts on a given character along with BaB somehow changes how Echoes works. I think there may even been speed boosts that are overwritten by Echoes that are better, and why I noticed small decreases in speed with certain combos.
It would be nice if someone else would test these things and post results for current game mechanics.