The 1.10 is designed to stop people rushing and getting to hell at lvl 5

A good hell rush is about 30 mins and leech to lvl 63 in 1 hr 30 mins.

Limiting the amount of xp cows give will prevent fast leveling, making the monsters harder will also slow the killing time too.

people will still find ways around power leveling unless it's made so you can not get XP in certain areas unless you are above a certain level.