Hello, it is planned to writte API documentation.
For Auction functions, it is generally lua scripts wrapper http://wow.gamepedia.com/World_of_Warcraft_API
Try to follow all steps http://wrobot.eu/forums/topic/1381-repairinstall-wrobot/#comment-966 but I don't know what can cause this problem. (you can also try in vmware or another computer)
You can get lua memory usage with lua script (run it is wow chat):
/run print(gcinfo())
Try to run this code before to start the bot and run it again when Wow fps going to down, but I don't think that problem is caused by lua (when lua is running out of memory wow crash) (but if wrobot is slow, he can slow down wow).
If you can update WRobot and try again.
Also, to use less CPU, in your fightclass you can try to put lower value in "Frame per second", try to use less spells.
In your quests profile, if you use loop (while) try to add wait time
Ok, your quests profile seem to use a lot of steps with c# code, I think than problem is caused by this, I'll try to create cache (currently WRobot recompile code for each usage).