The script is a bit time-wasting. When reached the furnace, the bot should immediate click on the gold bar and smelt it. Instead, the bot will hover the mouse to the furnace then to the bar, these kind of action wasted a lot of time. The truth is that your bot still have many improvement to make
Here is some suggestion about your future version.
link:
http://youtu.be/88K3FRnXpYs
This version must give you at least 35k+exp/hour with just using gold bar, Set this as a target, i am sure your bot will be the best one among others.