I have noticed that Xcode 4 seems to have a memory leak. When I run the program Activity monitor shows it using only 100 - 600MB of RAM, but over time my active memory usage slowly climbs to over 5GB. Has anyone else noticed this? I've read online and people have suggested that I just have to start and then restart Xcode, but this doesn't seem to free up the memory. I quit Xcode and let it sit for a few minutes, but active memory usage is still extremely high (even taking into account other programs running). Any suggestions?