This is more of a user tip than a suggestion - although a suggestion could come of it.
Most of us have collected libraries along the way and have installed them in previous versions of the IDE. So when a new IDE comes out, the easy thing to do is copy the libraries to a new version. (It might be nice if libraries could be kept in a common folder, and hence a suggestion for a path parameter.)
So the tip is that you should be sure to delete the .o files if you copy a library after a version up. I just did that with Rel 0013 and had significant savings on top of the significant savings I already got by switching to REL 0013.