Best Speed Build on S6 for GR Key farming?

[UnhallowedEssence]

Could you post which class / build are you using and which one is fastest in your experience?

d3planner will be appreciated thanks in advance!

 

[Oggy2k5]

http://www.diablofans.com/builds/78992-lon-bombardment-crusader-t10-speeds

Can usually get between 2-3 minutes per run, all depends on 1 hitting trash with thorn ticks.