My wildpack marksman takes a 10-20% penalty in damage when using the fast animations (AttackSpeed Multiplier). So, I figured, I will make a stormblade, the best dps class in the game for a single target. Here is the result, with fast animations and without. As you can see, using that feature of the mod is actually a disadvantage. At least for two of the dps classes:
video. The recording is from MuMu, low resolution. The link will expire in two days.