Hi, It seems that when even a single Nautilus system browser is open and you do a load (using Metacello), there is a huge amount of objects that get created and persisted in the image. This even leads to the point that the image crashes when I try to load our code using a ConfigurationOf. After some time, the Pharo process is stuck at 100%, image size is over 500MB and the entire image becomes unresponsive, finally crashing after an hour or so. I have not yet found which objects or why, but I just wrestled with this all day to find out what was going on. I first thought that Metacello was in an infinite loop but after noticing that the image was so large (500MB) and that it got reduced to 20% of its size after closing the browser window, I can say that Nautilus is gathering garbage. It is definitely not Metacello because I can trigger the same problem doing a load via Monticello only. When I load the ConfigurationOf without a single browser open, it loads 5x faster and the image size stays reasonable. Is this a known issue? Any thoughts on what may be causing this? regards! Johan