If you have crazy ass gear and can pretty much 1 shot things then you can clear at the same pace up till the point where you can't. At that point you become less efficient at a higher MP and it's not worth it unless the bonuses outweigh the time cost.
If you can 1 shot trash mobs with 4 million HP, let alone champs, let me know. The only possibility I see of that is someone who still has dual 2 handers equipped.
