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I aggre that the difference is minimal for DoT but think about skill speed on a bigger scheme.
Think about if you have multiple dots at a time,
Think about if you are able to fill in 1 more skill per 30 sec. of rotation. Its 20 skill on a 10 minutes fight. Huge difference
People seem to forget that the dot damage is in addition to lower gcds. You still get damage from hitting faster. Dots don't need to triple in damage to make ss useful.
I did the same test for HoTs some days ago, the results were pretty bad too with the min/max range completely overpowering the spellspeed buff.
Full data here http://forum.square-enix.com/ffxiv/threads/255329
Someone did some fairly comprehensive testing for Skillspeed a while back and learned that 72.5 Skillspeed is 1% more damage from DoTs. There's little reason to assume Spellspeed works much differently. SS is still garbage, and that's not even counting the messy rotation, clipping of DoTs for classes, or added TP consumption -- it's just notably smaller boost than det, crit, and certainly accuracy to cap are.