At the moment there are a Buff wich grants you about 500% haste.
I think it was somewhere in Spires of Arak and the buff fades if you leave the location. but the haste stays until you die.
But i can't remember where it was...
Challenge Mode BUG: +500% Haste ruining times - Forums - World of Warcraft
https://i.imgur.com/QiGKxkq.png
You can use http://www.wowhead.com/spell=175442 http://www.wowhead.com/guide=2659 and the Haste buff and it should be easy to do CM Gold
1,) Take FP to Akeeta's Hovel
https://i.imgur.com/ixk8750.jpg
2.) Stay on the east side of river and head south.
https://i.imgur.com/n1b2p5u.jpg
3.) Run to this building
https://i.imgur.com/TobmTU4.jpg
Stand on this pillar until you have 20 stacks of the buff DO NOT STEP OFF YOU WILL GET DEBUFF AND IT WILL NOT WORK
https://i.imgur.com/xlLQ2uo.jpg
Hearth Directly to your Garrison and the buff will leave your bars but check your stats. will see 500% damage and 500% haste.
FIXED