The EXP needed for some levels jumped up and down for no reason. For example, level 60 to 61 needed almost twice the EXP of the levels around it, while some levels needed less EXP than the level before them. These steps have been smoothed out: from level 30 to 63 every level now needs a bit more EXP than the one before. Leveling from 49 to 53 and from 60 to 62 is now quicker than before.
Levels 73 to 100
Levels after 72 used to get much harder all at once: going from 79 to 80 needed about 22,000 monsters. Now the effort grows step by step. Going from 73 to 100 needs about half the monsters it needed before (for example, 79 to 80 now needs about 5,500 monsters).