The post you responded to was already infracted, no need to shit up the thread further. Next time use the report button, thanks.
Furthermore your calculation is incorrect, since haste is multiplicative, so you cannot subtract to get the needed haste. You need to divide 1.125 by (1.05*1.03) = 1.040222, which is 516 rating. In the OP is a link to a post with the full explanation.
Originally Posted by Naryo
While we have DOTs on atleast 3 targets.
Actually he is correct, as he stated raid buffed. Without being raid buffed it would be:
Meaning that 4.35% haste is the current amount needed with the Pyromaniac bug to hit the soft haste cap that we strive for while unbuffed. This is VERY easily attainable.