Simply get rid of half the god damn "bonus" quests that involve killing npcs.... By the time I was lvl 40 I always wanted to slap myself for making the mistake of attacking a mob when I was blessed with a "gathering" quest.
I know some of you will just say: dont do it... unfortunately I had the bug that, sometimes, even after completing the main quest, I was stuck with the bonus quest. And I couldn't get rid of it, for some reasons.
So I just did all that I happened to come across, and that was a lot of mob killing. In addition, it just doesn't feel "complete" if you are one of these gamers who really like to do as many sidequests as possible in games
I am so insolent and claim that nobody can possibly have enjoyed the bonus quests that demanded to kill 30 mobs... followed by another 40.
It was really overkill after 40 lvls.