Dear help desk and R community, I have a problem on how R2.0 handle the RAM, maybe a bug In fact I used R1.9 since january 2004 with large data set using a macosx G5 with 1G of ram without problem . Then I passed to 2.0 and I found myself short in ram using virtual memory. I tried to use the program from terminal windows to avoid the GUI but it was the same. The annoying part is that even if I cancel big object from the workspace the RAM consumption do not decrease (looking at the percentage of usage in ps or the actual value in "activity monitor"). Only after a long time (1/2 hour ) the consumption of RAM decreased somewhat. When I use the workspace browser on the GUI and I use "refresh" the consumption of RAM fluctuate each time both decreasing and incresing even if the workspace do not change. For example I can pass from using 270mb of memory to 430mb (or the contrary) simply pushing several time refresh. The value is stable once I do not push refresh anymore thanks saverio