Putting more experience in the XP penalty experience.
I have a high level PC (now) in the level 18, which I "had" to put in blind drive to level. Ok.
I took a few days playing slow, crafting, or even simply leaving the PC on the shelf. After more or less one week, TODAY, I got the message "mentally exhausted", one below blind drive.
I went to Perfidus to rescue a party with other people. We killed some demons, I rested. when I rested, I gained the message "you could have performed better if you faced the right challenges" AND got back to blind drive.
Now, here comes, again, the point: I can understand getting or staying in penalty XP due to proud and quite satisfied, however, going up one level of penalty XP on the "you could have performed better" message doesn't make any sense unless the server WANTS the high levels to level at a fraction of the pace.