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Since it works as a percent you get the most out of longer cast spells.
0.1s of Shadowbolt makes it a 2.4s cast which is close to nothing, but in 25 casts you either get 25 casts at xxx more damage if you go for the damage or get one extra cast ~2000 dmg. And it's here the differance comes in. Here the additional damage in one more SB is greater than the per SB extra damage caused by more spell damage. But with instant cast spells you would only benefit with faster uptime on the dots which i doubt would add more damage.
The above only considers damage output and does not take consideration to the fact that with faster dots you get more time to cast time spells.
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