I really see no point to farming ledge. The bot having to run from middle, to one end and then backtrack to the other for a full clear is ludacris. Personally, I find farming Prisoner's Gate to be way more rewarding in both loot and experience for farming in Act 1. Not sure why rush to Western Forest when The Crossroads is only a level behind and far easier(even quicker to farm). However, Act 3, City of Sarn is the easiest spot to farm up until you're able to do Docks. Sarn, from my experience, gives far better loot. Those are really the only three major places you should be farming as far as I'm concerned. Anything else is just asinine.