This may be common knowledge but i haven't seen any posts regarding it.
when you get to the 4 pillars on the way to skeleton king, just run past. you don't have to kill them at all.
what I've been doing is go to the the 3 crypts, kill the elites and rares there for 3-4 stack, then just get the last 1-2 stack anywhere on the way down.
run/vault/tele through as much of royal crypts as possible. everything there is nerfed so dont worry about doing anyhting there. don't stop for the pillars, and leap/tele over the gap behind the 4 pillars (barb/wiz idk if DH can vault it) run to skele kings room and down you go.