Originally Posted by
Kietsu
This math is really solid - for Black Mage. But OP is asking about Summoner gear here, where Spell Speed is very much ignore-able - DoT ticks aren't affected by SSpd, Egi attacks aren't affected by SSpd, Fester, Rouse, Rouse More aren't on GCD - the only constant damage output effected by SSpd is Ruin, which has a potency of 80.
Mind you, I'm not a Summoner, and the only reason I dabble in it is because I mainly play Scholar, but I do get the feeling SSpd has no value to them.