Okay so what I have found so far is that this somehow seems to be related to walking. If I start the bot at the druids already it will sit there and fight, loot, etc and will hover around 5-7% of my CPU and around 380-410MB of RAM. However, as soon as the bot needs to bank the CPU usage shoots up randomly during walking, it does fall back down for me, what does not come back down is the amount of RAM being used, it stays between 660-700MB even after walking has finished. I'm trying to see what I can do about this, for walking I simply use the web walker, I'm not sure exactly why all the memory it apparently uses stays being used after it finishes walking.
Edit: I also found other uses describing a similar problem, one user even indicates it occurs during web walking: http://osbot.org/forum/topic/102753-scripts-cause-insane-freezing/#entry1148726
Edit x2: Also trying a private script of mine that is a simple gathering script, I'm doing this because there is far less code to sort through in the script, actually there is very little. I am experiencing the same issue when the script uses web walking.