Originally Posted by Kalman
It also represents an increase in MBs by way of MB cooldown beginning faster - a 0.25 second reduction in MB cast time is also an effective 0.25 second reduction in the cooldown in terms of how many MBs you cast, even though the actual CD remains the same.
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Yes, but the relative increase in DPS from haste on MB is less than with Mind Flay because of that CD. The MB component of your total DPS (assuming you can use it every cooldown) is always going to be limited by that cooldown. The absolute fastest you can cycle MB is once every 6.5 seconds. The slowest (still assuming 5/5 IMB) is once every 7.0 seconds. So haste is giving you a maximum DPS increase of 7.7% of MB's DPS.
The slowest Mind Flay is 3 seconds. The fastest (in theory) is 1 second. So in theory haste can increase Mind Flay's DPS by 300%. But even assuming you cap Haste at the same amount as that needed to reach MB's cap then that's still 1 Mind Flay every 2 seconds which means haste gives you a DPS increase of 50% of MF's DPS. And while Mind Blast hits for more than Mind Flay, a 50% increase in MF DPS's is going to outweigh a 7.7% increase in MB's DPS on an absolute level.
So yes, Haste does give a benefit to Mind Blast (and to SW
, VT and SW:P for that matter) but the compared to the benefit it gives Mind Flay these are minor improvements.