Looking for an act 3 paragon farming route? Watch this video! This is essentially the Alkaizer farming route, but if you've never heard of that, you might want to watch the video. If you have then you can really just skip this as you won't learn much of anything new.
This route isn't as popular as it once was because of experience nerfs to some of the monsters, as well as the fact that a lot of people got really tired of farming Act 3 for so long. Now with increased monster density in other acts, people will farm Act 1 quite frequently. As well the monsters tend to get more and more difficult the further you progress into the game which just means that the monsters are also typically easier to kill in Act 1.