I don't believe the impact is as much as you've mentioned as there's actually ability queueing in this game (Hence why you should be spamming your abilities). But yes, there will be an increase of DPS with a much lower latency. For Ninja's though, those numbers would be accurate. JP ninja's literally have no latency with Mudras so their DPS is much higher than their EU/NA counterparts.

Quote Originally Posted by Noxotic View Post
Couldn't you meld Skill Speed 3 instead of 4 on all meldable items in the first set and the loss would be around 3? That could be another way to save money on that set but still be over 390 skill speed?
Unfortunately, melding III's over IV's would render them trash, lol, and will be replaced by i130 counterparts. They have to be melded specifically like that, otherwise they'll not be BiS